Please refer to Chapter 9 Hydrogen MCQ Class 11 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Chemistry. Students should refer to MCQ Questions for Class 11 Chemistry with Answers to score more marks in Grade 11 Chemistry exams. Students should read the chapter Hydrogen and then attempt the following objective questions.

MCQ Questions Class 11 Chemistry Chapter 9 Hydrogen

The Hydrogen MCQ Class 11 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The normality of30 volume H₂O₂ is 
(a) 2.678 N
(b) 5.336 N
(c) 8.034 N
(d) 6.685 N     

Question. Among CaH₂ , NH₃NaH and B₂H₆ , which are covalent hydride ?
(a) NH₃ and B₂H₆
(b) NaH and CaH2
(c) NaH and NH3
(d) CaH₂ and B₂H₆         

Question. Hydrogen molecule differs from chlorine molecule in the following respect.
(a) Hydrogen molecule is non-polar but chlorine molecule is polar
(b) Hydrogen molecule is polar while chlorine molecule is non-polar
(c) Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not
(d) Hydrogen molecule cannot participate in coordinate bond formation but chlorine molecule can     

Question. The most abundant element in the universe is thought to be
(a) carbon
(b) oxygen
(c) hydrogen
(d) nitrogen     

Question. Moist hydrogen peroxide cannot be dried over cone. H₂SO₄ because
(a) it can catch fire
(b) it is reduced by H₂SO₄
(c) it is oxidised by H₂SO₄
(d) it is decomposed by H₂SO₄       

Question. The oxidation number of oxygen in hydrogen peroxide is
(a) + l
(b) – 1
(c) +2
(d) – 2       

Question. Hydrogen is prepared on large scale for industrial use 
(a) by Zn + H₂SO₄
(b) by Al + NaOH
(c) by Na + C₂H₅OH
(d) from water gas       

Question. Which one of the following is a covalent hydride?
(a) CaH₂
(b) NaH 
(c) BH₃
(d) BeH₂   

Question. In context with the industrial preparation of hydrogen from water gas (CO+ H₂ ), which of the following is the con-ect statement? 
(a) CO and H₂ are fractionally separated using differences in their densities
(b) CO is removed by absorption in aqueous Cu₂Cl₂ solution
(c) H₂ is removed through occlusion with Pd
(d) CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ in alkali       

Question. The strength of 10 volume of H₂O₂ solution is 
(a) IO g/L
(b) 68 g/L
(c) 60.70 g/L
(d) 30.36 g/L     

Question. Which of the following is responsible for the hardness of water? 
(a) CaHCO₃
(b) CaCI₂
(c) Both (a) and (b)
(d) None of these     

Question. When H₂O₂ is shaken with an acidified solution of K₂Cr₂O₇ in the presence of ether, the ethereal layer twns blue due to the formation of 
(a) Cr₂O₃
(b) CrO^2-₄
(c) Cr₂ (SO)₃
(d) CrO₅       

Question. Which of the following is not cotTect regarding the electrolytic preparation of H₂O₂ ? 
(a) Lead is used as cathode
(b) 50% H₂SO₄ is used
(c) Hydrogen is liberated at anode
(d) Sulphuric acid undergoes oxidation         

Question. Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly 
(a) 3
(b) 6
(c) 9
(d) 12       

Question. Temporary hardness process by adding of water is removed in Clark’s 
(a) caustic
(b) calgon
(c) borax
(d) lime       

Question. The volume strength of 1.5 NH₂O₂ solution is
(a) 16.8 L
(b) 8.4 L
(c) 4.2 L
(d) 5.2 L     

Question. The ortho and para hydrogen differ in respect of which of the following? 
(a) In the molecular weight
(b) In the nature of spin of protons
(c) In the nature of spin of electrons
(d) In the number of protons       

Question. Which one of the following is used for reviving the exhausted ‘permutit’ ?
(a) HCl solution
(b) IO% CaCl₂ solution
(c) 10% MgCl₂ solution
(d) 10% NaCl solution     

Question. The production of dihydrogen gas via water gas shift . a reaction, CO(g) + H²O(g) →_Catalyst^Δ CO₂ (g) + H₂ (g ).  The CO₂ gas is removed by scmbbing with solution of
(a) sodium arsenite
(b) calcium oxide 
(c) sodium phosphite
(d) aluminium oxide         

Question. Very pure hydrogen (99.9) can be made by which of the 2010 following processes?
(a) Reaction of methane with steam
(b) Mixing natural hydrocarbons of high molecular weight
(c) Electrolysis of water
(d) Reaction of salts like hydrides with water     

Question. Which of the following is not correct for D₂O?
(a) Boiling point is higher than H₂O
(b) D2Oreacts slowly than H₂O
(c) Viscosity is higher than H₂Oat 25°C
(d) Solubility of NaCl in it is more than H₂O     

Question. Which one of the following reactions gaseous product ?
(a) PbO₂ + H₂O₂ →
(b) Acidified KMnO₄ + H₂O₂ →
(c) PbS + H₂O₂ →
(d) CI₂ + H₂O₂ →       

Question. The pH of a solution of H₂O₂ is 6.0. Some chloride gas is bubbled into this solution. Which of the following is correct ? 
(a) The pH of resultant solution becomes 8.0
(b) Hydrogen gas is liberated from resultant solution
(c) The pH of resultant solution becomes less than 6.0 and oxygen gas is liberated
(d) Cl₂O is formed in the resultant solution     

Question. Which one of the following processes will produce hard water ?
(a) Saturation of water with CaCO₃
(b) Saturation of water with MgCO₃
(c) Saturation of water with CaSO₄
(d) Addition ofNa 2SO₄ to water       

Question. The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre of water is expressed as 
(a) 20 ppm
(b) 200 ppm
(c) 2000 ppm
(d) 240 ppm     

Question. Calgon used as water softener is 
(a) Na₂ [Na₄ (PO₃)₆]
(b) Na₂ [Na₄ (PO₃)₅]
(c) Na₄ [Na₂ (PO₃)₆]
(d) Noneofthese         

Question. The volume of oxygen liberated from 0.68 g of H₂O₂ is
(a) 112 mL
(b) 224 mL 
(c) 56 mL
(d) 336 mL     

Question. Adsorbed. hydrogen by palladium is known as 
(a) nascent
(b) atomic
(c) heavy
(d) occluded.     

Question. Permanent hardness can be removed by adding
(a) Cl₂
(b) Na₂CO₃
(c) Ca(OCl) Cl
(d) K₂CO₃         

Question. In which of the following reactions, H₂O₂ is acting as a reducing agent? 
(a) SO₂ + H₂O₂ → H₂SO₄
(b) 2KI + H₂O₂ → 2KOH + I₂
(c) PbS + 4H₂O₂ → PbSO₄ + 4H₂O
(d) Ag₂O + H₂O₂ → 2Ag+ H₂O+ O₂     

Question. Which of the following statements is correct? Dielectric constant of H₂O₂
(a) increases with dilution
(b) decreases with dilution
(c) is unaffected on dilution
(d) None of these     

Question. In transforming 0.01 mole of PbS to PbSO₄, the volume of 10. volume H₂O₂ required will be 
(a) 11.2 mL
(b) 22.4 mL
(c) 33.6 mL
(d) 44.8 mL     

Question. Hydrogen is not obtained when Zn reacts with 
(a) cold water
(b) hot NaOH solution
(c) dil. H₂SO₄
(d) dil. HCl     

Question. H₂O₂ is manufactured these days
(a) by the action of H₂O₂on BaO₂
(b) by the action of H₂O₂ on H₂O₂
(c) by electrolysis of 50% H₂SO₄
(d) by burning hydrogen in excess of oxygen       

Question. K_a of H₂O₂ isoftheorderof 
(a) 10^-12
(b) 10^-14
(c) 10^-16
(d) 10^-10     

Question. Heavy water is represented as 
(a) H₂¹⁸O
(b) D₂O
(c) D₂¹⁸O     
(d) H₂Oat4°C         

Question. Decomposition of H₂O₂ is prevented by
(a) KOH
(b) MnO₂
(c) acetanilide
(d) oxalic acid         

Question. Assertion (A) NaCl is less soluble in heavy water than in ordinary water.
Reason (R) Dielectric constant of ordinary water is more than that of heavy water.
(a) Both A and R are co1Tect and R is the correct explanation of A
(b) Both A and R are correct but R is not the correct explanation of A
(c) A is correct but R is not correct
(d) A is not correct but R is correct         

Question. Which of the following is an exan1ple of interstitial hydride?
(a) NH₃
(b) CH₄
(c) ZnH₂
(d) H₂O     

Question. Which cannot be oxidised by H₂O₂ ?
(a) Na₂SO₃
(b) PbS
(c) Kl
(d) O₃         

Question. H₂O₂ is formed by which of the following compounds?
(a) Na₂O₂
(b) NaOH 
(c) Na₂O
(d) KO₂         

Question. Which is false about H₂O₂ ?
(a) Act as both oxidising and reducing agent
(b) Two OH bonds lie in the same plane
(c) Pale blue liquid
(d) Can be oxidised by ozone       

Question. Electrolysis ofX gives Yat anode. Vacuum distillation of Y gives H₂O₂. The number ofperoxy (O—O) bonds present in X and Y respectively are
(a) 1 ,1
(b) 1 ,2
(c) zero, 1
(d) zero, zero     

Question. What is formed when calcium carbide react with heavy water?
(a) C₂D₂
(b) CaD₂
(c) CaD₂O
(d) CD₂     

Question. Water possesses a high dielectric constant, therefore
(a) it always contains ions 
(b) it is universal solvent
(c) can dissolve covalent compounds
(d) can conduct electricity     

Question. What is the volume of ’20 volume H₂O₂ ‘ required to get 5000 cm³ of oxygen at STP ? 
(a) 250 cm³
(b) 20 cm³
(c) 100 cm³
(d) 125 cm³     

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