Notes are being written
The board questions below are real and complete — they come from the CBSE papers themselves. The written notes for this topic are still being prepared.
Board questions on this topic
2 from the CBSE papers we hold — the exact wording the board used.
2024MCQ·1 mark·Q1
When 2 mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as:
- (a) NaOH + Zn -> NaZnO_2 + H_2
- (b) 2NaOH + Zn -> Na_2ZnO_2 + H_2
- (c) 2NaOH + Zn -> NaZnO_2 + H_2
- (d) 2NaOH + Zn -> Na_2ZnO_2 + H_2O
2023MCQ·1 mark·Q3
MnO_2 + x HCl -> MnCl_2 + y H_2O + z Cl_2. In order to balance the above chemical equation, the values of x, y and z respectively are:
- (a) 6, 2, 2
- (b) 4, 1, 2
- (c) 4, 2, 1
- (d) 2, 2, 1