Please see below Class 12 Chemistry Sample Paper Set C with solutions. We have provided Class 12 Chemistry Sample Papers with solutions designed by Chemistry teachers for Class 12 based on the latest examination pattern issued by CBSE. We have provided the following sample paper for Class 12 Chemistry with answers. You will be able to understand the type of questions which can come in the upcoming exams.

CBSE Sample Paper for Class 12 Chemistry Set C

Very Short Answer-Objective Type Questions

A. Multiple choice Questions:

Question. Which of the following statements is not correct.
(a) Some antiseptics can be added to soaps.
(b) Dilute solutions of some disinfectants can be used as antiseptic.
(c) Disinfectants are antimicrobial drugs.
(d) Antiseptic medicines can be ingested.

Question. The most useful classification of drugs for medicinal chemists is :
(a) on the basis of chemical structure.
(b) on the basis of drug action.
(c) on the basis of molecular targets.
(d) on the basis of pharmacological effect.

Question. The compound that causes general anti-depressant action on the central nervous system belongs to the class of :
(a) analgesics.
(b) tranquillizers.
(c) narcotic analgesics.
(d) antihistamines.

Question. Compound which is added to soap to impart antiseptic properties is __________.
(a) sodium laurylsulphate
(b) sodium dodecylbenzenesulphonate
(c) rosin
(d) bithional

Question. Equanil is ______________.
(a) artificial sweetener.
(b) tranquilizer.
(c) anti-histamine.
(d) anti-fertility drug.

Question. A narrow spectrum antibiotic is active against__________ .
(a) Gram-positive or Gram-negative bacteria.
(b) Gram-negative bacteria only.
(c) Single organism or one disease.
(d) Both Gram-positive and Gram-negative bacteria.

Question. Which of the following will not enhance nutritional value of food?
(a) Minerals
(b) Artificial sweeteners
(c) Vitamins
(d) Amino acids

Question. Which of the following enhances lathering property of soap?
(a) Sodium carbonate
(b) Sodium rosinate
(c) Sodium stearate
(d) Trisodium phosphate

B. Match the following :

Question. Match the detergents given in Column I with their uses given in Column II.

Answer. (i) → c, (ii) → d, (iii) → b, (iv) → a

C. Answer the following:

Question. What are limited spectrum antibiotics ? Give one example ? 
Answer. Narrow spectrum antibiotics are effective against a single organism or disease and referred to as limited spectrum antibiotics, e.g., penicillin G

Question. What is meant by narrow spectrum antibiotics ?
Answer. The antibiotics which kill or inhibit a short range of gram-positive or gram-negative bacteria are known as narrow spectrum antibiotics.

Question. State a reason for the following statement :
The use of sweetener aspartame is limited to cold foods and drinks. 
Answer. Because it is unstable at high temperature.

Question. What is the cause of a feeling of depression in human beings ? Name a drug which can be useful treating depression. 
Answer. Low level of noradrenaline is responsible for the feeling of depression in human beings. 
Iproniazid is a drug, used to counteract the effect of depression.

Short Answer Type Questions 

Question. Explain the following terms with suitable examples :
(i) Cationic detergents
(ii) Anionic detergents.
Answer. (i) Cationic detergents : These are quaternary ammonium salts of amines with acetates, chlorides and bromides, e.g., cetyltrimethylammonium bromide. 
(ii) Anionic detergents : These are sodium salts of sulphonated long chain alcohols or hydrocarbons e.g., sodium dodecylbenzene sulphonate. 

Question. Describe and illustrate with an example, a detergent.
Answer. They are sodium or potassium salts of sulphonated long chain hydrocarbons e.g., sodium alkyl benzene sulphonate i.e., sodium dodecylbenzene sulphonate.

Question. What are biodegradable and non-biodegradable detergents ? Give one example of each class.
Answer. Biodegradable detergents : Detergents which are decomposed by microorganisms present in the environment are called biodegradable detergents. These detergents have linear alkyl chains. Sodium lauryl sulphate and sodium dodecylbenzene sulphonate are examples of biodegradable detergents.
Non-biodegradable detergents : Detergents are those which are not degraded by microorganisms. Such detergents cause environmental problem. It is observed that such detergents contain branched chain which is not attacked by bacteria. Example of non-biodegradable detergents is given below :

Question. What are food preservatives ? Name two such substances. 
Answer. Chemical substances which are used to protect food against bacteria, fungi are called food preservatives e.g., sodium benzoate, sodium metabisulphite. 

Question. Differentiate between disinfectants and antiseptics. Give one example of each group.
Answer. Disinfectant : These are chemicals which kill microorganisms or prevent their growth but are not safe for human beings. These are applied to inanimate objects such as floors, drainage systems. Some substances can act as an antiseptic as well as disinfectant by varying the concentration. For example, 0.2% solution of phenol is an antiseptic while its one percent solution is disinfectant.
Antiseptic : These are the chemicals which prevent the growth of micro-organisms or kill them but are not harmful to human beings. These are applied externally to the living tissues such as wounds, cuts and diseased skin surfaces. Dettol (chloroxylenol + α-terpineol), bithional, furacin, dilute solution of boric acid are common example of antiseptics.

Question. With reference to which classification has the statement, “ranitidine is an antacid” been given?
Answer. The above statement refers to the classification of pharmacological effects of the drug. This is because any drug that is used to counteract the effects of excess acid in the stomach is called an antacid. Antacids are the medicinal agents which decreases the excess level of hydrochloric acid in stomach. Ranitidine belongs to the class of Histamine receptors blockers, where they block the action of H2 receptors present in stomach, which are responsible for the excess secretion of gastric acid in stomach.

Long Answer Type Questions-I 

Question. What are the following substances ? Give one example of each one of them :
(i) Tranquillizers,
(ii) Food preservatives,
(iii) Synthetic detergents. 
Answer. (i) Tranquillizers : are chemicals compounds used for the treatment of stress and mild or even severe mental diseases. e.g., equanil/meprobamate/veronal.
(ii) Food preservatives : are the compounds which prevent spoilage of food due to microbial growth. e.g., sodium benzoate, vinegar.
(iii) Synthetic detergents : are cleansing agents which have all the properties of soap but actually do not contain any soap. e.g., Sodium lauryl sulphate.

Question. (i) What are disinfectants ? Give an example.
(ii) Give two examples of macromolecules that are chosen as drug target.
(iii) What are anionic detergent ? Give an example.
Answer. (i) Disinfectants are the chemicals which kill or prevent the growth of microorganisms.
For example : 1% solution of phenol. 
(ii) Proteins, Nucleic acid.
(iii) Anionic detergents are sodium salts of sulphonated long chain alcohols or hydrocarbons. In anionic detergents, the anionic part of the molecule is involved in the cleansing action. 
Example : Sodium lauryl sulphate, sodium dodecylbenzene sulphonate 

Question. Define the following :
(i) Anionic detergents
(ii) Broad spectrum antibiotics
(iii) Antiseptic 
Answer. (i) Anionic detergents are sodium salts of sulphonated long chain alcohol or hydrocarbons/alkylbenzene sulphonate or detergents whose anionic part is involved in cleansing action. 
(ii) Broad spectrum antibiotics: Antibiotics which kill or inhibit a wide range of Gram-positive and Gram-negative bacteria. 
(iii) Antiseptic are the chemicals which either kill or prevent growth of microbes on living tissue. 

Question. Define the following :
(i) Cationic detergent
(ii) Narrow spectrum antibiotics
(iii) Disinfectant
Answer. (i) Cationic detergents are quaternary ammonium salts of amines with acetates chlorides or bromides as anions, cationic part has long chain hydrocarbons/detergents whose cationic part is involved in cleansing action. 
(ii) Narrow spectrum antibiotics are effective mainly against Gram-positive and gram-negative bacteria 
(iii) Disinfectants kill or prevent growth of microbes and are applied on inanimate/non-living objects 

Question. Define the following :
(i) Anionic detergents :
(ii) Limited spectrum antibiotics
(iii) Tranquillizers 
Answer. (i) Anionic detergents are sodium salts of sulphonated long chain alcohol or hydrocarbons/ alkylbenzene sulphonate or detergents whose anionic part is involved in cleansing action. 
(ii) Limited spectrum antibiotics are effective against a single organism or disease. 
(iii) Tranquillizers are class of chemicals used for treatment of stress or mild or severe mental disease.

Question. Define the following :
(i) Anionic detergents
(ii) Narrow Spectrum antibiotics
(iii) Antacids 
Answer. (i) Anionic detergents are sodium salts of sulphonated long chain alcohol or hydrocarbons/alkylbenzene sulphonate or detergents whose anionic part is involved in cleansing action. 
(ii) Narrow spectrum antibiotics are effective mainly against Gram-positive and gram-negative bacteria. 
(iii) Chemical compound which are used for the treatment of excess acid produced in the stomach.

Question. (i) Name a substance which can be used as an antiseptic as well as disinfectant.
(ii) Name an artificial sweetener whose use is limited to cold food and drinks.
(iii) What are cationic detergents?
Answer. (i) Phenol / 0.2% phenol is antiseptic while 1% is disinfectant. 
(ii) Aspartame. 
(iii) Cationic detergents are quaternary ammonium salts of amines with acetates, chlorides or bromides anions/Cationic part has a long chain hydrocarbons which is involved in cleansing action. 

Question. Write the therapeutic action of following on human body and mention the class of drugs to which each of these belong :
(i) Ranitidine
(ii) Morphine
(iii) Aspirin 
Answer. (i) Treatment of hyperacidity 
Class : Antacids 
(ii) Relieve pain and produce sleep 
Class : Narcotic analgesics 
(iii) Relieve pain and reduce fever 
Class : Non- Narcotic analgesics / Analgesics 

Question. Write the therapeutic action of following on human body and mention the class of drugs to which each of these belong :
(i) Equanil
(ii) Aspirin
(iii) Chloramphenicol
Answer. (i) Controlling depression and hypertension 
Class : Tranquillizers 
(ii) Relieve pain and reduce fever 
Class : Non- Narcotic analgesics / Analgesics 
(iii) Kills or inhibits the growing of micro organisms
Class : Antibiotic 

Question. (i) Give two examples of macromolecules that are chosen as drug targets.
(ii) What are antiseptics ? Give an example.
(iii) Why is the use of aspartame limited to cold foods and soft drinks ?
Answer. (i) Carbohydrates, lipids, proteins, enzymes, nucleic acids (Any two).  
(ii) Antiseptics are the chemical substances which are used to kill or prevent the growth of microbes, e.g., Dettol/Iodoform/Boric acid/phenol (or any other correct example)
(iii) Because it is unstable at cooking temperature. 

Question. (i) Name sweetening agent used in the preparation of sweets for a diabetic patient.
(ii) What are antibiotics ? Give an example.
(iii) Give two examples of macromolecules that are chosen as drug targets. 
Answer. (i) Sucralose (or any other) 
(ii) Antibiotics are the chemical substances that inhibit the growth or even destroy microorganisms. 
Example : Ofloxacin, Chloramphenicol (or any other) 
(iii) Proteins, Nucleic acid. 

Question. (i) Which one of the following is a food preservative equanil, morphine, sodium benzoate ?
(ii) Why is bithional added to soap ?
(iii) Which class of drug is used in sleeping pills ?
Answer. (i) Sodium benzoate is a food preservative. 
(ii) Bithional is added to soaps to reduce the odours produced by bacterial decomposition of organic matter on the skin due to its antiseptic properties. 
(iii) Tranquillizers are used in sleeping pills. 

Question. (i) What class of drug is ranitidine ?
(ii) If water contains dissolved Ca²⁺ ions, out of soaps and synthetic detergents, which will you use for cleaning clothes ?
(iii) Which of the following is an antiseptic ? 0.2% phenol, 1% phenol. 
Answer. (i) It is an antacid and helps in removing acidity of stomach. 
(ii) As the water contain Ca²⁺ ions, therefore it is hard water. Hence synthetic detergents are preferred over the soaps for cleaning the clothes because calcium salts of detergents are soluble in water while calcium salts of soap are insoluble. As a result, lot of soap is wasted.
(iii) 0.2% solution of phenol is used as an antiseptic whereas 1% solution of phenol acts as a disinfectant. 

Question. (i) Pick out the odd one from among the following on the basis of their medicinal properties mentioning the reason : Luminal, Seconal,Phenacetin, Equanil.
(ii) Give an example of a substance that can act as a disinfectant as well as antiseptic depending upon its concentration. (Specify concentration)
(iii) Name any two macromolecules chosen as drug targets.
Answer. (i) Phenacetin is an antipyretic, while the rest are tranquillizers. 
(ii) 0.2% solution of phenol acts as antiseptic whereas 1% solution of phenol acts as disinfectant. 
(iii) Carbohydrates, proteins, nucleic acids, lipids.

Question. (a) Why is bithional added to soap ?
(b) What is tincture of iodine ? Write its one use.
(c) Among the following, which one acts as a food preservative ?
Aspartame, Aspirin, Sodium Benzoate,Paracetamol 
Answer. (a) To impart antiseptic properties 
(b) 2-3% solution of iodine in alcohol – water mixture/ iodine dissolved in alcohol , used as an antiseptic/ applied on wounds.
(c) Sodium benzoate / Aspartame 

Question. Give reasons for the following:
(i) Use of aspartame as an artificial sweetener is limited to cold foods.
(ii) Metal hydroxides are better alternatives than sodium hydrogen carbonate for treatment of acidity.
(iii) Aspirin is used in prevention of heart attacks.
Answer. (i) It is unstable at cooking temperature. 
(ii) Excessive hydrogencarbonate can make the stomach alkaline and trigger the production of even more acid. Metal hydroxides being insoluble do not increase the pH above neutrality. 
(iii) Aspirin has anti blood clotting action.