(A) 2H2 (g) +O2 (g) → 2H2O(I)
(B) Zn+2(aq) + 2e– → Zn (s)
(C) Cr(s) → Cr+3 (aq) + 3e-3
(D) Pb(s) + Cl2(g) → PbCl2(s)
Answer: (C) Cr(s) → Cr+3 (aq) + 3e-3
Chemistry solved multiple choice questions (MCQs) for class 9 with answers.
(A) 2H2 (g) +O2 (g) → 2H2O(I)
(B) Zn+2(aq) + 2e– → Zn (s)
(C) Cr(s) → Cr+3 (aq) + 3e-3
(D) Pb(s) + Cl2(g) → PbCl2(s)
Answer: (C) Cr(s) → Cr+3 (aq) + 3e-3
(A) Oxidation
(B) Reduction
(C) Redox reaction
(D) Neutralization reaction
Answer: (B) Reduction
(A) 85% m/m NaCl solution
(B) 15% m/v NaCl solution
(C) 15% v/v NaCl solution
(D) 15% m/m NaCl solution
Answer: (D) 15% m/m NaCl solution
(A) Supersaturated solution
(B) Unsaturated solution
(C) Saturated solution
(D) Solution of liquid
Answer: (B) Unsaturated solution
(A) Evaporation
(B) Melting
(C) Boiling
(D) Sublimation
Answer: (D) Sublimation