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Chemical Reactions and Equations MCQ Class 10 Science

Read these Chemical Reactions and Equations Class 10 MCQ pdf with answers. This Class 10 Science Chapter 1 MCQ is prepared by our expert teachers on the latest exam pattern of the CBSE Board Exam. It will help you to make your preparation better to score good marks in your exam.

Please refer to Chapter 1 Chemical Reactions and Equations MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Chemical Reactions and Equations and then attempt the following objective questions.

MCQ Questions Class 10 Science Chapter 1 Chemical Reactions and Equations

The Chemical Reactions and Equations MCQ Class 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. A substance which oxidises itself and reduces other is known as – 
(a) oxidising agent
(b) reducing agent
(c) both of these
(d) none of these

Answer

B

Question. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of- 
(a) a combination reaction
(b) a displacement reaction
(c) a decomposition reaction
(d) a double decomposition reaction

Answer

D

Question. Which of the following is a displacement reaction?

Answer

B

Question. Fe2O3 + 2Al → Al2O3 +2Fe     
The above reaction is an example of a-   
(a) combination reaction
(b) double displacement reaction
(c) decomposition reaction
(d) displacement reaction

Answer

D

Question. Which of the following reactions involves the combination of two elements?   
(a) CaI + CO2 → CaCO3
(b) 4Na + O2 → 2Na2
(c) SO2+1/2O → SO3
 (d) NH3 + HCl → NH4Cl

Answer

B

Question. A student added dilute HCl to a test tube containing zinc granules and made following observations :   
(a) the zinc surface became dull and black
(b) a gas evolved which burnt with a pop sound
(c) the solution remained colourless
(d) the solution becomes green in colour

Answer

B

Question. Ethane (C2H6) on complete combustion gave CO2 and water. It shows that the results are in accordance with the law of conservation of mass. Then, the coefficient of oxygen is equal to   
(a) 3
(b) 5/2
(c) 2
(d) 7/2

Answer

D

Question. Which of the following statements about the given reaction are correct?
3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(a) (i), (ii) and (iii)
(b) (iii) and (iv)
(c) (i), (ii) and (iv)
(d) (ii) and (iv)

Answer

C

Question. The process of reduction involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen

Answer

B

Question. Oxidation is a process which involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen

Answer

A

Question. Magnesium ribbon is rubbed before burning because it has a coating of
(a) basic magnesium carbonate
(b) basic magnesium oxide
(c) basic magnesium sulphide
(d) basic magnesium chloride

Answer

A

Question. Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solution contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s)
is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.

(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (iv), (ii) and (iii)

Answer

C

Question. MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 Identify the substance oxidized in the above equation.
(a) MnCl2
(b) HCl
(c) H2O
(d) MnO2

Answer

D

Question. Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1 : 2
(b) 1 : 1
(c) 2 : 1
(d) 1 : 8

Answer

C

Question. Which among the following statement(s) is (are) true?
Exposure of silver chloride to sunlight for a long duration turns grey due to
(i) the formation of silver by decomposition of silver chloride
(ii) sublimation of silver chloride
(iii) decomposition of chlorine gas from silver chloride
(iv) oxidation of silver chloride
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iv) only

Answer

A

Question. Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Ans. (a) (i) and (ii)
In both the cases, heat energy is evolved.

Answer

A

Question. Which of the following is a physical change? 
(a) Formation of curd from milk
(b) Ripening of fruits
(c) Getting salt from sea water
(d) Burning of wood

Answer

C

Question. What happens when copper rod is dipped in iron sulphate solution?   
(a) Copper displaces iron
(b) Blue colour of copper sulphate solution is obtained
(c) No reaction takes place
(d) Reaction is exothermic

Answer

C

Question. A powdered salt (X) in a dry test tube was heated that evolves brown fumes of nitrogen dioxide and a yellow residue of lead oxide is also formed. The salt (X) is   
(a) MgSO3
(b) Pb(NO3)2
(c) (NH4)2SO4
(d) CaCO3

Answer

B

Question. A dilute solution of sodium carbonate was added to two test tubes – one containing dil HCl (a) and the other containing dilute NaOH(b). The correct observation was- 
(a) a brown coloured gas liberated in test tube A
(b) a brown coloured gas liberated in test tube B
(c) a colourless gas liberated in test tube A
(d) a colourless gas liberated in test tube B

Answer

C

Question. White silver chloride in sunlight turns to-   
(a) grey
(b) yellow
(c) remain white
(d) red

Answer

A

Question. When Ca(NO3)2 is heated, it gives CaO, NO2(g) and O2(g). The correct number of moles of Ca(NO3)2 ,CaO, NO2(g) and O2(g) are present in the reaction are respectively   
(a) 2, 1, 3, 2
(b) 2, 2, 4, 1
(c) 2, 2, 2, 1
(d) 1, 2, 4, 1

Answer

B

Question. A balanced chemical equation is in accordance with-   
(a) Avogadro’s law
(b) law of multiple proportion
(c) law of conservation of mass
(d) law of gaseous volumes

Answer

C

Question. When copper powder is heated it gets coated with-   
(a) black copper oxide
(b) yellow copper oxide
(c) red copper oxide
(d) None of these

Answer

A

Question. The equation   
Cu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O    
The values of x and y are-
(a) 3 and 5
(b) 8 and 6
(c) 4 and 2
(d) 7 and 1

Answer

C

Question. Which of the following is a thermal decomposition reaction?   
(a) 2H 2 O → 2H 2 + O 2
(b) 2AgCl → 2Ag + Cl2 
(c) H 2 (g) + Cl 2 (g) → 2HCl(g)
(d) ZnCO 3 → ZnO + CO 2

Answer

D

Question. A substance added to food containing fats and oils is called:     
(a) Oxidant
(b) Rancid
(c) Coolant
(d) Antioxidant

Answer

D

Question. What happens when dilute hydrochloric acid is added to iron filling? Tick the correct answer   
(a) Hydrogen gas and iron chloride are produced.
(b) Chlorine gas and iron hydroxide are produced
(c) No reaction takes place
(d) Iron salt and water are produced

Answer

A

Question. A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.   
(a) CaOCl 2
(b) Ca (OH) 2
(c) CaO
(d) CaCO3

Answer

B

Question. Assertion: Magnesium ribbon keeps on burning in atmosphere of nitrogen.     
Reason: Magnesium reacts with nitrogen to form magnesium nitrides and this reaction is combination reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

A

Question. The process of reduction involves   
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of hydrogen

Answer

B

Question. Which of the following gases can be used for storage   
(a) Carbon dioxide or Oxygen
(b) Nitrogen or Oxygen
(c) Carbon dioxide or Helium
(d) Helium or Nitrogen

Answer

D

Question. When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because:     
(a) it is decomposed to ferric oxide
(b) it loses water of crystallisation
(c) it forms SO 2
(d) it forms SO3

Answer

B

Question. Dissolving sugar is an example of-
(a) Physical change
(b) Chemical change
(c) Redox Reaction
(d) None of these.

Answer

A

Question. Which of the following reactions is an exothermic reaction?
(a) Burning of coal.
(b) Decomposition of vegetable matter into compost.
(c) Process of respiration
(d) Decomposition of calcium carbonate to form quicklime and carbon dioxide

Answer

D

Question. The reaction of H2 gas with oxygen gas to form water is an example of ta ped
(a) combination reaction
(b) redox reaction
(c) exothermic reaction
(d) all of these reactions

Answer

D

Question. Dissolving suger is an example of-
(a) Physical change
(b) Chemical change
(c) Redox Reaction
(d) None of these.

Answer

A

Question. Which of the following statement is incorrect ?
(a) Oxidation is addition of oxygen
(b) Reduction is addition of hydrogen
(c) Oxidising agent is oxidised
(d) Reducing agent is oxidised

Answer

C

Question. The term used of indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is
(a) Acidity
(b) Radioactivity
(c) Rabbity
(d) Rancidity

Answer

D

Question. Which of the following reaction is also be termed as thermal decomposition reaction?
(a) Combination reaction
(b) Decomposition reaction
(c) Displacement reaction
(d) Double displacement reaction

Answer

B

Question. Which one of the following processes involves a chemical reaction?
(a) Liquification of air
(b) Heating copper wire in presence of air at high temperature
(c) Keeping petrol in a china dish in the open
(d) Storing of oxygen gas under pressure in a gas cylinder

Answer

B

Question. In the chemical equation : 2H2S + xO2 → yH2O + 2SO2, x and y are respectively :
(a) 2, 2
(b) 2, 3
(c) 1, 1
(d) 3, 2,

Answer

D

Question. The condition produced by serial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
(a) antioxidation
(b) reduction
(c) rancidity
(d) corrosion

Answer

C

Question. Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is displacement reaction.       
Reason: Zinc reacts with oxygen to form zinc oxide.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

B

Question. What is observed when a solution of potassium iodide is added to silver nitrate solution?     
(a) No reaction takes place
(b) White precipitate of silver iodide is formed
(c) yellow precipitate of Agl is formed
(d) Agl is soluble in water.

Answer

C

Question. PbS reacts with ozone (O 3 ) and forms pbso 4 . As per the balanced equation, molecules of ozone required for every one molecule of PbS is/are   
(a) 4
(b) 3
(c) 2
(d) 1

Answer

A

Question. Assertion: A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.     
Reason: Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as precipitation reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

B

Question. Chemically rust is   
(a) Hydrated ferrous oxide
(b) hydrated ferric oxide
(c) only ferric oxide
(d) none of these

Answer

B

Question. The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of   
(a) Decomposition Reaction
(b) Displacement Reaction
(c) Double Displacement Reaction
(d) Neutralisation Reaction

Answer

C

Question. Select the oxidising agent for the following reaction: H 2 S + I 2 > 2HI + S   
(a) I 2
(b) H 2 S
(C) HI
(d) S

Answer

A


Question. Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride
(ii) sublimation of silver chloride
(iii) decomposition of chlorine gas from silver chloride
(iv) oxidation of silver chloride
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iv) only

Answer

A

Question. Chemically rust is
(a) ferric sulphate
(b) ferric oxide
(c) hydrated ferrous oxide
(d) hydrated ferric oxide

Answer

D

Question. The chemical formula of lead sulphate is
(a) Pb2SO4
(b) Pb(SO4)2
(c) PbSO4
(d) Pb2(SO4)3

Answer

C

Question. Both CO2 and H2 gases are
(a) heavier than air
(b) acidic in nature
(c) colourless
(d) soluble in water

Answer

C

Question. What is the name of reaction which decomposes after supply of heat?
(a) Combination reaction
(b) Thermal decomposition
(c) Displacement reaction
(d) Redox reaction

Answer

B

Question. What is the name of reaction in which both oxidation and reduction takes place?
(a) Combination reaction
(b) Thermal decomposition
(c) Displacement reaction
(d) Redox reaction

Answer

D

Question. Which of the following gases can be used for storage of fresh sample of an oil for a long time?
(a) Carbon dioxide or oxygen
(b) Nitrogen or helium
(c) Helium or oxygen
(d) Nitrogen or oxygen

Answer

B

25. The electrolytic decomposition of water gives H2 and O2 in the ratio of
(a) 2 : 1 by volume
(b) 1 : 2 by volume
(c) 8 : 1 by mass
(d) 1 : 2 by mass

Answer

D

Question. In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is
(a) 1
(b) 2
(c) 3
(d) 4

Answer

D

Question. Fatty foods become rancid due to the process of
(a) reduction
(b) corrosion
(c) oxidation
(d) hydrogenation

Answer

C

Question. We store silver chloride in a dark coloured bottle because it
(a) is a white solid
(b) undergoes redox reaction
(c) decomposes by sunlight
(d) none of the above

Answer

C

Question. Which of the following are combination reactions?
(i) 2KClO3 2KCl + 3O2 (ii) MgO + H2O Mg(OH)2
(iii) 4Al + 3O2 2Al2O3 (iv) Zn + FeSO4 ZnSO4 + Fe
(a) (i) and(iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (ii) and (iii)

Answer

D

Question. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
(a) 2H2(l) + O2(l) 2H2O(g)
(b) 2H2(g) + O2(l) 2H2O(l)
(c) 2H2(g) + O2(g) 2H2O(l)
(d) 2H2(g) + O2(g) 2H2O(g)

Answer

D

Question. Silver article turns black when kept in the open for a few days due to formation of
(a) H2S
(b) AgS
(c) AgSO4
(d) Ag2S

Answer

D

Question. When crystals of lead nitrate are heated strongly in a dry test tube
(a) crystals immediately melt
(b) a brown residue is left
(c) white fumes appear in the tube
(d) a yellow residue is left

Answer

D

Question. When a magnesium ribbon is burnt in air, the ash formed is
(a) black
(b) white
(c) yellow
(d) pink

Answer

B

Question. In which of the following, heat energy will be evolved?
(a) Burning of L.P.G.
(b) Dissolution of NH4Cl in water
(c) Electrolysis of water
(d) Decomposition of AgBr in the presence of sunlight

Answer

A

Question. Rancidity can be prevented by
(a) adding antioxidants
(b) storing food away from light
(c) keeping food in refrigerator
(d) all of these

Answer

D

Question. The reaction of H2 gas with oxygen gas to form water is an example of
(a) combination reaction
(b) redox reaction
(c) exothermic reaction
(d) all of these reactions

Answer

D

Question. An element X on exposure to moist air turns reddish-brown and a new compound Y is formed.
The substance X and Y are
(a) X = Fe, Y = Fe2O3
(b) X = Ag, Y = Ag2S
(c) X = Cu, Y = CuO
(d) X = Al, Y = Al2O3

Answer

A

Question. Which of the following does show oxidation reaction?
(a) Gain of oxygen
(b) Loss of oxygen
(c) Gain of hydrogen
(d) None of the above

Answer

A

Question. Which of the following does show reduction reaction?
(a) Gain of oxygen
(b) Loss of oxygen
(c) Loss of hydrogen
(d) None of the above

Answer

B

Question. Which of the reaction is used in black and white photography?
(a) Combination reaction
(b) Decomposition reaction
(c) Displacement reaction
(d) Oxidation reaction

Answer

B

Question. Which of the following is termed as endothermic reaction?
(a) Reaction in which heat is evolved
(b) Reaction in which heat is absorbed
(c) Reaction in which there is loss of oxygen
(d) Reaction in which there is gain of hydrogen

Answer

B

Question. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.
(a) The surface of metal becomes shining
(b) The reaction mixture turns milky
(c) Odour of a pungent smelling gas is recorded
(d) A colourless and odourless gas is evolved

Answer

D

Question. When carbon dioxide is passed through lime water,
(a) calcium hydroxide is formed
(b) white precipitate of CaO is formed
(c) lime water turns milky
(d) colour of lime water disappears.

Answer

C

Question. Formula of Sodium Sulphate
(a) Na2SO4
(b) NaSO2
(c) Na2SO3
(d) NaS

Answer

A

Question. A redox reaction is one in which :
(a) Both the substance are reduced
(b) Both the substance are oxidized
(c) One is oxidized while the other is reduced
(d) An acid is neutralized by the base

Answer

C

Question. Silver chloride turns ……………….in sunlight.
(a) Blue
(b) Green
(c) Yellow
(d) Grey

Answer

D

Question. The electrolytic decomposition of water gives H, and 0, in the ratio of
(a) 2:1 by volume
(6) 1:2 by volume
(c) 8:1 by mass
(d) 1:2 by mass

Answer

A

Question. To facilitate the electrolysis of water we add a few drops of acids like salphuric acid because
(a) It acts as a catalyst
(b) It prevents the decomposition of Electrodes used.
(c) It makes the water a good conductor of electricity
(d) None

Answer

C

Question. Which of the following is termed as endothermic reaction?
(a) Reaction in which heat is evolved
(b) Reaction in which heat is absorbed
(c) Reaction in which there is loss of oxygen
(d) Reaction in which there is gain of hydrogen

Answer

B

Question. Ferrous sulphate crystals has ………….in color.
(a) Yellow
(b) Blue
(c) Green
(d) Red

Answer

C

Question. Which of the following can be decomposed by the action of light?
(a) NaCl
(b) KCl
(c) AgCl
(d) CuCl

Answer

C

Question. For the reaction……., …….., ……. are not indicates above and below the arrow in the equation.
(a)T emperature
(b) Pressure
(c) Catalyst
(d) Reactant

Answer

D

Question. Action of dilute sulphuric acid on zinc.
(a) formation of sulphuric zinc
(b) zinc get more diluted
(c) carbondioxide formed
(d) formation of hydrogen gas

Answer

D

Question. Which of the following is termed as exothermic reaction?
(a) Reaction in which heat is evolved
(b) Reaction in which heat is absorbed
(c) Reaction in which there is loss of oxygen
(d) Reaction in which there is gain of hydrogen

Answer

A

Question. The reaction in which two compounds exchange their ions to form two new compounds is called
(a) displacement reaction
(b) combination reaction
(c) double displacement reaction
(d) redox reaction

Answer

C

Question. On immersing an iron nail in CuSO4 solution for few minutes, you will observe
(a) no reaction takes place
(b) the colour of solution changes to green
(c) the surface of iron nails acquire a black coating
(d) the colour of solution fades away

Answer

B

Question. When a cleaned iron nail is placed in copper sulphate solution, the colour of the solution changes to
(a) Blue
(b) Red
(c) pale violet
(d) pale green

Answer

D

Question. When ferrous sulphate is heated strongly name the gas evolved?
(a) SO2
(b) SO3
(c) Fe2O3
(d) SO2 and SO3

Answer

D

FILL IN THE BLANK

Question. Precipitation reactions produce ………. salts.

Answer

insoluble

Question. The addition of oxygen to a substance is called ……….

Answer

oxidation

Question. The digestion of food in the body is an example of ……… reaction.

Answer

decomposition reaction

Question. Electrolysis of water is a ………. decomposition reaction.

Answer

electric

Question. The reaction of sodium sulphate and barium chloride results in the formation of white precipitate of ……….

Answer

barium sulphate

Question. Two different atoms or groups of atoms (ions) are exchanged in ………. reactions.

Answer

double displacement

Question. Precipitation reactions produce ……… salts.

Answer

insoluble

Question. Reduction is the ………. of oxygen or gain of hydrogen.

Answer

loss

Case Study Based Questions

Read the following and answer any four questions from (i) to (v):
Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

Question. The substance not likely to contain CaCO3 is
(a) Dolomite
(b) A marble statue
(c) Calcined gypsum
(d) Sea shells

Answer

C

Question. A student added 10 g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After sometime, an increase in pressure was observed, pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place?

(a) 15-20 min
(b) 10-15 min
(c) 5-10 min
(d) 0-5 min

Answer

D

Question. Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process—
(a) Respiration
(b) Photosynthesis
(c) Transpiration
(d) Photolysis

Answer

B

Question. Marble statues are corroded or stained when they repeatedly come into contact with polluted rain water. Identify the main Reason.

(a) Decomposition of calcium carbonate to calcium oxide.
(b) Polluted water is basic in nature hence it reacts with calcium carbonate.
(c) Polluted water is acidic in nature hence it reacts with calcium carbonate.
(d) Calcium carbonate dissolves in water to give calcium hydroxide.

Answer

C

Question. Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above
process?
(a) Sodium
(b) Sodium oxide
(c) Calcium
(d) Calcium oxide

Answer

D

Chemical Reactions and Equations Class 10 MCQ Free PDF Download

Class 10 Chemical Reaction and Equation MCQ is great for preparing for the CBSE Class 10 board examinations. CBSE Class 10 Science Syllabus is much bigger and requires concentrated efforts on the part of the student to face the examinations and pop out a success.

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