Question

Salts 'A' and 'B' on reaction with dil H2SO4 liberates gases X’and 'Y' respectively. Both turn lime
water milky and milkiness disappred when excess of gases are passed 'X' has pungent suffocating
small and turn acidified paper green, where ‘Y'is colour less, odourless gas. Salts 'A & B’are
(A) Na2CO3
(B) Na2S03
(C) Nas
(D) COONH,
COONHA​

Answer 1

Answer:

Explanation:

Carbon dioxide passed into limewater gives a milky solution. This is due to the insoluble suspension of calcium carbonate formed. If excess Carbon dioxide is added, the milkiness disappears since calcium bicarbonate formed, is water-soluble.

Answer 2

Answer:

Salt A and B are Options (B) Na₂SO₄and (A) Na₂CO₃ respectively.

Explanation:

• When the salt A which is the option  (B) Na₂SO₄ reacts with dilute sulphuric acid it gives Sodium sulphate along with Sulphur dioxide and water.
• The Sulphur dioxide is the gas X mentioned in the question which turns the lime water milky and the milkiness disappears when an excess of gases passes and has a pungent suffocating smell.
• The salt B which is option (A) Na₂CO₃ reacts with dilute sulphuric acid and gives sodium sulphate along with Carbon dioxide and water.
• The Carbon dioxide is the gas Y which turns the lime water milky and is colourless, odourless gas.