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4 votes
Addition of 6 M HCl to which substance will NOT result in gas evolution?

(A) Al
(B) Zn
(C) K2CO3
(D) NaNO3

The answer is D but can someone explain how to get that answer, please?

User Mfanto
by
8.5k points

2 Answers

4 votes

Answer: The correct answer is Option D.

Step-by-step explanation:

The reaction of HCl with every substance given in the option follows the equations:

  • Option A: Al

The reaction of aluminium with hydrochloric acid produces aluminium chloride and hydrogen gas. The equation follows:


2Al+6HCl\rightarrow 2AlCl_3+3H_2

Thus, this substance evolve gas on reaction.

  • Option B: Zn

The reaction of zinc with hydrochloric acid produces zinc chloride and hydrogen gas. The equation follows:


Zn+2HCl\rightarrow ZnCl_2+H_2

Thus, this substance evolve gas on reaction.

  • Option C:
    K_2CO_3

The reaction of potassium carbonate with hydrochloric acid produces potassium chloride, water and carbon dioxide gas. The equation follows:


K_2CO_3+2HCl\rightarrow 2KCl+H_2O+CO_2

Thus, this substance evolve gas on reaction.

  • Option D:
    NaNO_3

The reaction of sodium nitrate with hydrochloric acid produces sodium chloride and nitric acid. The equation follows:


NaNO_3+HCl\rightarrow NaCl+HNO_3

Thus, this substance will not evolve gas on reaction.

Hence, the correct answer is Option D.

User Dan Levin
by
8.6k points
3 votes

Answer;

D. NaNO3

Explanation;

The reaction between NaNO3 and HCl will not produce a gas, but form NaCl and HNO3.

The reaction will be;

NaNO3 + HCl → NaCl + HNO3

This shows that no gas is evolved, when NaNO3 and HCl are reacted.

User Ruena
by
8.7k points
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