Question

Metal (M) produces a gas (N) on reaction with alkalies like NaOH and KOH. Same gas is produced when the metal reacts with dilute sulphuric acid. Gas (N) reacts with another toxic gas (P) to form methanol at high temperature and pressure. (N) also reacts with metals like (Q) to form electrovalent hydrides. M, N, P and Q respectively are:

• A. $Zn,H_2,CO,Na$
• B. $Na,H_2,C{l}_2,Ca$
• C. $Al,H_2,H_{2}S,B$
• D. $Mg,H_2,N{O}_2,Al$

Answer 1

The correct option is A $Zn,H_2,CO,Na$

$Zn+2NaOH\to N{a}_{2}Zn{O}_2+H_2$

$Zn+H_{2}S{O}_4\to ZnS{O}_4+H_2$

Carbon monoxide (P- toxic gas) and hydrogen react over a catalyst to produce methanol.

At 5–10 MPa (50–100 atm) and 250 °C (482 °F), the reaction is characterized by high selectivity (>99.8%):

$CO+2H_2\to C{H}_{3}OH$

Sodium (Na) reacts with hydrogen $\left(H_2\right)$ to form sodium hydride $\left(NaH\right)$

So, option A is correct.