MCQ Practice – Class 6 to 10

Q1. The reaction between an acid and a base produces:

A. Only water B. Salt and water C. Oxygen D. Only salt

Q2. Which solution is used to detect base?

A. Litmus B. Phenolphthalein C. Iodine D. Methyl orange

Q3. Which indicator turns pink in basic solution?

A. Litmus B. Turmeric C. Methyl orange D. Phenolphthalein

Q4. A solution with pH 2 is:

A. Neutral B. Strongly acidic C. Weakly acidic D. Basic

Q5. Which of the following is a natural indicator?

A. Copper sulphate B. Phenolphthalein C. Litmus D. Methyl orange

Q6. What is the pH of the human stomach?

A. 10 B. 4–5 C. 1.5–3.5 D. 7

Q7. Which of these acids is used in pickles?

A. Sulphuric acid B. Phosphoric acid C. Acetic acid D. Nitric acid

Q8. The chemical formula of washing soda is:

A. Na2CO3·10H2O B. CaCO3 C. NaHCO3 D. MgCO3

Q9. Which of the following is a base?

A. H2SO4 B. NaOH C. HNO3 D. HCl

Q10. Tooth decay occurs when pH of the mouth drops below:

A. 7 B. 3 C. 5.5 D. 1

Quiz – Acids, Bases and Salts