1. . The bases give ______ ions in water:
(A) H⁺
(B) BF₃
(C) H⁻
(D) OH⁻
2. . Which one is a Lewis acid?
(A) F⁻
(B) OH⁻
(C) NH₃
(D) BF₃
3. . Which one is a Lewis base?
(A) AlCl₃
(B) H₃O⁺
(C) BF₃
(D) NH₃
4. . The process in which a base reacts with oil and forms soap is called:
(A) Saponification
(B) Halogenation
(C) Neutralization
(D) Oxidation
5. . The basicity of CH₃COOH is:
(A) 2
(B) 1
(C) 3
(D) 4
6. . The acidity of sodium hydroxide is:
(A) 4
(B) 2
(C) 3
(D) —
7. . Which one is alkali?
(A) KOH
(B) Cu(OH)₂
(C) Al(OH)₃
(D) Ba(OH)₂
8. . Alum is an example of:
(A) Complex
(B) Basic
(C) Acidic
(D) Double
9. . The pH of pure water is:
(A) 4
(B) 0
(C) 14
(D) 7
10. . The solution having pH 6 is called:
(A) Weak acid
(B) Strong base
(C) Strong acid
(D) Weak base
11. . pH is equal to:
(A) log[H⁺]
(B) log[OH⁻]
(C) +log[H⁺]
(D) +log[OH⁻]
12. . The number of ionizable hydrogen atoms present in an acid molecule is called its:
(A) Acidity
(B) Basicity
(C) Allotropy
(D) Radioactivity
13. . According to Lewis concept, an acid:
(A) Accepts proton
(B) Donates pair of electrons
(C) Accepts pair of electrons
(D) Donates proton
14. . KH₂PO₄ is:
(A) Double
(B) Basic
(C) Neutral
(D) Acidic
15. . The pH range of a basic solution is:
(A) 1 to 4
(B) 5 to 6
(C) 0 to 7
(D) 8 to 14
16. . How many water molecules are in the crystal of copper sulphate (CuSO₄·xH₂O)?
(A) 5
(B) 12
(C) 7
(D) 6
17. . The nature of a solution having pH more than seven will be:
(A) Neutral
(B) Acidic
(C) Amphoteric
(D) Basic
18. . Which one is a double salt?
(A) CuSO₄·5H₂O
(B) Na₂CO₃·10H₂O
(C) Na₂SO₄
(D) K₂SO₄·Al₂(SO₄)₃
19. . What will be the effect of mixing more water in an acidic solution?
(A) pH will decrease
(B) pH will increase
(C) pH will remain constant
(D) pH will become 14
20. . Which one has a slippery touch?
(A) Acid
(B) Base
(C) Salt
(D) Double salt