Question

When carbon monoxide is passed over solid caustic soda heated to \[{200^0}C\]. It forms:
A.$N{a_2}C{O_3}$
B.$NaHC{O_3}$
C.$HCOONa$
D.$C{H_3}COONa$

Answer 1

Hint: At first think about the overall reaction between carbon dioxide and solid caustic soda without any conditions. Sodium hydroxide is also known as caustic soda. Pure sodium hydroxide is a colorless crystalline solid.

Complete step by step answer:
Carbon monoxide reacts with sodium hydroxide to produce sodium formate. This reaction takes place over pressure, temperature \[{120^0}C - {200^0}C\] and in the presence of a catalyst.
$CO + NaOH \to HCOONa$

Hence option (C) is correct.
Additional Information:- Carbon monoxide is colorless, odorless and tasteless flammable gas that is slightly less dense than air. It is toxic to animals that use hemoglobin as an oxygen carrier when encountered in concentrations above about $35ppm$. It is the simplest oxocarbon and is isoelectronic with other triple bonded diatomic species. In coordination complexes the carbon monoxide ligand is called carbonyl.
Sodium hydroxide is also known as lye and caustic soda. It is a white solid ionic compound consisting of sodium cations and hydroxide anions. Sodium hydroxide is a highly caustic base and it is highly soluble in water. It readily absorbs moisture and carbon dioxide from air. It is used in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a dry cleaner.
Sodium formate is the sodium salt of formic acid. Because of the low-cost and large scale availability of formic acid by carbonylation of methanol and hydrolysis of the resulting methyl formate, sodium formate is usually prepared by neutralizing formic acid with sodium hydroxide.

Note:
The formation of sodium formate using the above method is for commercial use. Sodium formate crystalizes in a monoclinic crystal system. Sodium formate is slightly water-hazardous and inhibits some species of bacteria but is degraded by others.