Question

A substance 'X' reacts with dilute nitric acid to produce
a colourless gas. This gas is dissolved in water to form a
solution with pH value less than 7. Identify the substance
'X'.
(A) Sodium chloride (B) Sodium oxide
(C) Sodium hydroxide (D) Sodium carbonate​

Answer 1

Answer:

sodium carbonate

Explanation:

when reacted with HNO3

produces co2

co2 reacts with water to form H2CO3... Acidic in nature

Answer 2

The substance is D) Sodium Carbonate.

• Sodium hydroxide (Na₂CO₃) is a strong base. Its pH > 7.
• Nitric Acid (HNO₃) has pH < 7.
• The reaction is as follows:

       Na₂CO₃ + HNO₃    --->   NaNO₃ + H₂O + CO₂

• Carbon dioxide is an oxide of a non-metal (carbon). Hence it is an acidic oxide.
• When dissolved in water it forms carbonic acid (pH < 7)

      CO₂ + H₂O --> H₂CO₃

• Sodium Chloride does not react with dilute nitric acid.