Question

25. Zinc metal react with X to form zinc sulphate along with a gas Y which burns with pop sound X and Y are
(a) X: H2S04 Y: CO2
(b) X: H2SO4 Y: H2
(C) X: HCL Y: H2
(d) X: HCI Y: CO2​

Answer 1

Zinc metal reacts with X to form zinc sulphate along with a gas Y which burns with pop sound X and Y are $\[{H_2}S{O_4}\]$ and $\[{H_2}\]$ respectively. Thus, the correct option is (b) X: $\[{H_2}S{O_4}\]$ Y: $\[{H_2}\]$.

Explanation:

• When zinc metal reacts with sulphuric acid, it forms zinc sulphate and hydrogen gas.
• The reaction is given as:

        $\[Zn + {H_2}S{O_4} \to ZnS{O_4} + {H_2}\]$

• When hydrogen gas is burnt, it gives a pooing sound. This is used as a test to identify hydrogen gas.
• Therefore, X is sulphuric acid while Y is hydrogen gas.

Answer 2

X and Y are (b) X: H2SO4 Y: H2

• As we know of metals that they react with acids to form salt and hydrogen gas. In this case, Zinc would react with an acid like H2SO4 to form the salt zinc sulphate. Hence, then X will be H2SO4
• Zn has higher reactivity than hydrogen so it would displace it with ease.
• As we know the reaction between metals and acids is accompanied with the liberation of hydrogen gas. Hence, Y will be H2.
• So, the correct answer is (b) X: H2SO4 Y: H2 .