MCQ Questions for Class 7 Science Chapter 5 : NCERT solutions for Class 7 Science MCQs Chapter 5 “Acids, Bases and Salts” with Answers PDF Free Download prepared here according to the latest CBSE syllabus and NCERT curriculum. Class 7 Science MCQs Multiple Choice Questions for all Chapter.
MCQ Questions for Class 7 Science Chapter 5 Acids, Bases and Salts with answer PDF
Q1. Which of the following is not a indicator?
(a) Phenolphthalein
(b) Methyl orange
(c) Litmus
(d) Sodium chloride
Answer: (d) Sodium chloride
Q2. An oxide is acidic and has a pungent odour. It could be
(a) sulphur dioxide
(b) carbon dioxide
(c) sodium oxide
(d) nitrogen dioxide
Answer: (d) nitrogen dioxide
Q3. When CO2 gas is passed through limewater, it turns milky. Which of the following compounds is responsible for this milkiness ?
(a) Calcium oxide
(b) Calcium chloride
(c) sodium carbonate
(d) Calcium carbonate
Answer: (d) Calcium carbonate
Q4. The reaction in which an acid react with a base to form salt and water is called as
(a) Addition reaction
(b) Displacement reaction
(c) Neutralisation reaction
(d) Substitution reaction
Answer: (c) Neutralisation reaction
Q5. Out of these gases which one is used in fire extinguishers
(a) CO2
(b) SO2
(c) NO2
(d) H2S
Answer: (a) CO2
Q6. Which of the following ion is responsible for the acidic nature of hydrochloric acid ?
(a) Hydrogen ion
(b) Hydroxide ion
(c) Chloride ion
(d) Hydrochloride ion
Answer: (a) Hydrogen ion
Q7. Acid present in soured curd is
(a) Lactic acid
(b) Acetic acid
(c) Tartaric acid
(d) Oxalic add
Answer: (a) Lactic acid
Q8. The correct way of making a solution of acid in water is to
(a) add water to acid
(b) add acid to water
(c) mix acid and water simultaneously
(d) add water to acid in a shallow container
Answer: (b) add acid to water
Q9. Distilled water is:
(a) acidic
(b) basic
(c) neutral
(d) none of these
Answer: (c) neutral
Q10. Which of the following is a strong Base?
(a) Copper hydroxide
(b) Sodium hydroxide
(c) Iron hydroxide
(d) Calcium oxide
Answer: (b) Sodium hydroxide
Q11. Products of a neutralisation reaction are always:
(a) an acid and a base
(b) an acid and a salt
(c) a salt and water
(d) a salt and a base
Answer: (c) a salt and water
Q12. Ammonia that turns red litmus blue is:
(a) acidic
(b) basic
(c) neutral
(d) none of these
Answer: (b) basic
Q13. Which one of the following salts is used for making detergent powder?
(a) Washing soda
(b) Potassium nitrate
(c) Sodium bicarbonate
(d) Common salt
Answer: (a) Washing soda
Q14. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.
(a) Yellow in both acid and base
(b) Yellow in acid and red in base
(c) Pink in acid and yellow in base
(d) Red in acid and blue in base
Answer: (b) Yellow in acid and red in base
Q15. An antacid tablet is given to a person when he suffers from:
(a) obesity
(b) acidity
(c) dog bite
(d) none of these
Answer: (b) acidity
Q16. Acid present in cold drinks (soft drinks) is
(a) Carbonic acid
(b) Citric acid
(c) Tartaric acid
(d) Sulphuric acid
Answer: (a) Carbonic acid
Q17. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:
(a) red and blue
(b) blue and red
(c) pink and colourless
(d) colourless and pink
Answer: (d) colourless and pink
Q18. Ant’s bite injects:
(a) acetic acid
(b) formic acid
(c) hydrochloric acid
(d) none of these
Answer: (b) formic acid
Q19. Sour things contain
(a) Salts
(b) Neutral
(c) Bases
(d) Acids
Answer: (d) Acids
Q20. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
(a) Organic matter
(b) Quick lime
(c) Slaked lime
(d) Calamine solution
Answer: (a) Organic matter
