Question

The colour of sodium chromate is:
A.Black
B.Red
C.Yellow
D.Green

Answer 1

Hint: Sodium chromate is an inorganic compound. The molecular formula for sodium chromate is $\text{N}{\text{a}}_{\text{2}}\text{Cr}{\text{O}}_{\text{4}}$. Sodium chromate is also known as chromic acid. The colour of sodium chromate is the same as that of potassium chromate.

Complete step by step answer:
-Sodium chromate is an inorganic compound having molecular formula $\text{N}{\text{a}}_{\text{2}}\text{Cr}{\text{O}}_{\text{4}}$. Sodium chromate is an intermediate in extracting chromium from its ores.
-The structure of sodium chromate is as follows:

-Sodium chromate can be obtained by roasting of chromium ores in the air in the presence of sodium carbonate.
-Sodium chromate is odourless and it is slightly soluble in ethanol.
-Sodium chromate appears as yellow crystals. Thus, the colour of sodium chromate is yellow.
So, the correct answer is “Option C”.

Additional Information:
The uses of sodium chromate are as follows:
1.Sodium chromate is used in extraction of chromium from its ores.
2.Sodium chromate is used in the petroleum industry to inhibit corrosion.
3.Sodium chromate is used in the textile industry for dyeing because of its bright yellow colour.
4.Sodium chromate is used in pharmaceuticals to determine the volume of red blood cells.
5.Sodium chromate is used in organic chemistry as an oxidising agent to convert primary alcohols to carboxylic acids and secondary alcohols to ketones.

Note:
Sodium chromate is a carcinogenic substance i.e. it can cause cancer. Also, sodium chromate is corrosive in nature. Exposure to sodium chromate may cause severe damage to the eyes, blindness, impaired fertility, heritable genetic damage, etc.