Question Paper
Class / Subject: Class 10 (CBSE) · Science
Chapter: Chapter 2 — Chapter 2: Acids, Bases and Salts
Time Allowed: 15 minutes
Max Marks: 6
1. Acids turn blue litmus paper: [1]
(A) red
(B) blue
(C) green
(D) colourless
2. A soluble base is specifically called an: [1]
(A) alkali
(B) salt
(C) oxide
(D) ester
3. The gas released when a metal reacts with an acid can be tested with: [1]
(A) a burning splint (pop sound)
(B) limewater
(C) litmus paper
(D) phenolphthalein
4. A solution with pH 7 is: [1]
(A) neutral
(B) strongly acidic
(C) strongly basic
(D) undefined
5. The salt and by-product formed when hydrochloric acid reacts with sodium hydroxide are: [1]
(A) sodium chloride and water
(B) sodium chloride only
(C) water only
(D) sodium hydroxide and water
6. Human blood normally maintains a pH of about: [1]
(A) 7.4
(B) 3.0
(C) 10.0
(D) 0.5