3. The pH values of four solutions A, B, C and D are given. The solutions A, B, C and D respectively are:(A) Strong acid, weak acid, neutral, strong base(B) Weak acid, neutral, weak base, strong base(C) Weak acid, neutral, strong base, weak base(D) Weak acid, neutral, strong base, strong acid Answer: (B) Weak acid, […]
CBSE BOARD 2025 SET 31/3/1
2. The products formed when aluminium and magnesium are burnt in the presence of air respectively are:(A) Al₃O₄ and MgO₂(B) Al₂O₃ and MgO(C) Al₃O₄ and MgO(D) Al₂O₃ and MgO₂ Answer: (B) Al₂O₃ and MgO
1. Electrolysis of water is a decomposition reaction. What is the mass ratio of hydrogen and oxygen gases liberated at the electrodes?(A) 8:1(B) 2:1(C) 1:2(D) 1:8 Answer: (D) 1:8