Question

(a) When sodium is burnt in chlorine, sodium chloride is formed, and when molten sodium chloride is electrolysed, then sodium and chlorine are formed. What type of reaction takes place
(i) in the first case?
(ii) in the second case?
(b) When hydrogen is passed over heated copper oxide, copper and steam are formed. Write a balanced chemical equation for this reaction. State which of the chemicals is oxidised and which one is reduced?
​(c) What would you observe when zinc is added to a solution of iron sulphate? Write the chemical equation of the reaction which takes place. Why does this reaction occur?

Answer 1

Explanation:

1. Combustion
2. Decomposition

Answer 2

The value corresponding to 12 divisions is 0.85 A.

Explanation:

• Any device of measurement has the lease count, which is the least reading taken by the device. So, lease count is equal to value in ‘n’ divisions.
• There will be ten divisions in an ammeter. So, one division is equal to 0.05. Thus, corresponding to 17 divisions, the value is 0.85 A.
• It is to be noted that an ammeter is used for measuring the circuit’s current.