Acids, Bases & Salts: Class 10 Previous Year Questions

Acids, Bases & Salts questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. What is the function of diaphragm in human respiratory system ? Where is it present in human body ?
   Board 20261 markvery short
2. Read the following passage and answer the questions that follow : In the given diagram, when electricity is passed through an aqueous solution of a common salt, a substance ‘Z’ is produced, along with the evolution of gases ‘X’ and ‘Y’. When a burning matchsti…
   Board 20263 marksshort answer
3. (a) Explain chlor-alkali process with chemical equation. Name the products formed at anode and cathode. OR (b) Write the preparation of following compounds with balanced chemical equation : (i) Baking soda (ii) Bleaching powder (iii) Plaster of Paris
   Board 20263 marksshort answer
4. The natural sources of oxalic acid, lactic acid and methanoic acid respectively are : (A) tomato, curd, ant-sting (B) tomato, orange, nettle-sting (C) orange, milk, ant-sting (D) orange, sour milk, nettle-sting
   Board 20262 marksshort answer
5. What are amphoteric oxides ? (a) (b) Categorise the following based on their nature : ZnO, Na2O, CO2
   Board 20262 marksshort answer
6. The pH of the gastric juices released during digestion is : 1 (A) Less than 7 (B) More than 7 (C) Equal to 7 (D) Equal to
   Board 20262 marksshort answer
7. A student notices that her silver jewellery turned dull and had a grey-black coating over it after wearing for a few months. What results in the change in colour of the silver metal ? 1 (A) The polish over the jewellery was removed after wearing for a few mont…
   Board 20262 marksAssertion-Reason
8. Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student ? (A) Turmeric (B) Vanilla essence (C) Methyl orange (D) Litmus Page 11 of 24 19 (A)NO O2 (B)N2 NO2 (C)NO2 H2 (D) NO2 7T O2 20. (A) -COOH (B) -CHO (C) -C- (…
   Board 20261 markMCQ
9. When ferrous sulphate crystals are heated in a test tube, we observe that : 1 (A) A colourless gas with no smell is evolved. (B) A brown gas is evolved. (C) The green colour of the salt fades and a gas with the smell of burning sulphur is evolved. (D) The gree…
   Board 20261 markMCQ
10. Consider the following reactions : (i) Dilute hydrochloric acid reacts with sodium hydroxide. (ii) Magnesium oxide reacts with dilute hydrochloric acid. (iii) Carbon dioxide reacts with sodium hydroxide. It is found that in each case : (A) Salt and water is fo…
    Board 20251 markMCQ
11. Acid-base indicators can be used to distinguish between an acid and a base. Universal indicator, a mixture of several indicators, shows different colours at different concentrations of acids and bases, thereby indicating their pH on the pH scale of 0 – 14. The…
    Board 20254 marksshort answer
12. The following table shows the pH values of four solutions A, B, C and D on a pH scale : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 The solutions A, B, C and D respectively are of a (A) Strong acid, weak acid, neutral, strong base (B) Weak acid, neutral, weak base, stron…
    Board 20251 markMCQ
13. Secretion of less saliva in mouth will effect the conversion of : (A) proteins into amino acids (B) fats into fatty acids and glycerol (C) starch into simple sugars (D) sugars into alcohol
    Board 20251 markMCQ
14. The breakdown of glucose has taken the following pathway : Glucose (a) ⎯⎯⎯ → Pyruvate + Energy (b) ⎯⎯⎯ → Lactic acid + Energy The sites ‘a’ and ‘b’ respectively are : (A) Mitochondria and Oxygen deficient muscle cells (B) Cytoplasm and Oxygen rich muscle cells…
    Board 20251 markMCQ
15. The body of human beings works within the pH range of : (A) 61 to 68 (B) 65 to 73 (C) 70 to 78 (D) 75 to 81
    Board 20251 markMCQ
16. Salts play a very important role in our daily life. Sodium chloride which is known as common salt is used almost in every kitchen. Baking soda is also a salt used in faster cooking as well as in baking industry. The family of salts is classified on the basis o…
    Board 20244 marksshort answer
17. (i) The pH of a sample of tomato juice is 4.6. How is this juice likely to be in taste ? Give reason to justify your answer. (ii) How do we differentiate between a strong acid and a weak base in terms of ion-formation in aqueous solutions ? (ii) The acid rain …
    Board 20243 marksshort answer
18. Assertion (A) : Hydrogen gas is not evolved when zinc reacts with nitric acid. Reason (R) : Nitric acid oxidises the hydrogen gas produced to water and itself gets reduced.
    Board 20241 markAssertion-Reason
19. Solid Calcium oxide reacts vigorously with water to form Calcium hydroxide accompanied by the liberation of heat. From the information given above it may be concluded that this reaction (A) is endothermic and pH of the solution formed is more than 7. (B) is ex…
    Board 20241 markMCQ
20. Juice of tamarind turns blue litmus to red. It is because of the presence of an acid called : (A) methanoic acid (B) acetic acid (C) tartaric acid (D) oxalic acid
    Board 20241 markMCQ

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