Question

An aqueous solution of salt ‘R’ when treated with dil HCl, a colourless gas is given out. The gas so evolved when passed through acidified KMnO4 decolourises KMnO4 solution. The salt ‘R’ is

Solution

Correct option is

Na2SO3

 

Since ‘R’ gives a colourless gas on reaction with dil HCl, so it contains CO32- or SO32- as anion (i.e., CO2 or SO2 is evolved)

Since the gas decolourises acidified KMnO4 solution so it is SO2 and thus the anion present is SO32- i.e., the salt ‘R’ is Na2SO3.

SIMILAR QUESTIONS

Q1

Which of the following is called black ash?

Q2

An alloy of which pair of metals is liquid at ordinary temperature and is used in special thermometers used for finding temperature above the boiling point of mercury.

Q3

Which of the following compounds is used in preparation of green fire?

Q4

Which of the following is obtained on hydrolysis of Mg2C3?

Q5

Which of the following is a component of most kidney stones?

Q6

Which property of sodium is being used in street lights?

Q7

Which of the following metals is sensitive to a wide range of photons from across the entire visible range of the electromagnetic spectrum?

Q8

Out of the following hydroxide, select the one that has highest solubility and the least negative lattice enthalpy.

Q9

What is the function of potassium nitrate in gun powder?

Q10

Which of the following can be used in submarines both to absorb carbon dioxide and liberate oxygen?