Given below are two statements:
Statement-I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas.
Statement-II: Sodium nitrite reacts with NH$$_4$$Cl to give H$$_2$$O, N$$_2$$ and NaCl.
In the light of the above statements, choose the most appropriate answer from the options below:

Statement I: Methane and steam passed over heated Ni catalyst produces hydrogen gas.

This is the steam reforming reaction:

$$\text{CH}_4 + \text{H}_2\text{O} \xrightarrow{\text{Ni, } 1270 \text{ K}} \text{CO} + 3\text{H}_2$$

This is indeed used commercially to produce hydrogen gas (syngas). Statement I is correct.

Statement II: Sodium nitrite reacts with NH$$_4$$Cl to give H$$_2$$O, N$$_2$$ and NaCl.

The reaction is:

$$\text{NaNO}_2 + \text{NH}_4\text{Cl} \xrightarrow{\Delta} \text{NaCl} + \text{N}_2 + 2\text{H}_2\text{O}$$

This reaction is a well-known method to prepare dinitrogen gas in the laboratory. Statement II is correct.

Both statements I and II are correct.