Question

Which of the following statements is not correct?

• A. All metal carbonates react with acid to give a salt, water, and carbon dioxide
• B. All metal oxides react with water to give salt and acid
• C. Some metals react with acids to give salt and hydrogen
• D. Some non-metal oxides react with water to form an acid

Answer 1

The correct option is B

All metal oxides react with water to give salt and acid

Explanation for correct options:

(B)All metal oxides react with water to give salt and acid.

• All metal oxides react with water to give metal hydroxide.
• The reaction is as follows:-
• $\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)$
• All metal oxides react with water does not give salt and acid.
• All metal oxides react with dilute acids to form salt and water.

Explanation for incorrect options:

(A)All metal carbonates react with acid to give salt, water, and carbon dioxide.

• All metal carbonates react with acid to give salt, water, and carbon dioxide.

${\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

(C)Some metals react with acids to give salt and hydrogen.

• Some metals react with acids to give salt and hydrogen.
• But hydrogen gas is not evolved when a metal reacts with dilute nitric acid.
• It is because nitric acid is a strong oxidizing agent.

$\mathrm{Mg}\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{MgCl}}_2\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

(D)Some non-metal oxides react with water to form an acid.

• Non-metal reacts with oxygen to produce non-metal oxides.
• No-metal oxides react with water to produce acids.

${\mathrm{SO}}_3\left(\mathrm{l}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)$

Hence, option (B) is correct, all-metal oxides reacting with water to give salt and acid is not the correct statement.