Question

Which of the following substances are soluble in water?

• A. Iron sulphate
• B. Copper sulphate
• C. Iron nail
• D. Carbon dioxide

Answer 1

Answer: (A), (B), (D)

Carbon dioxide

Explanation for the correct options:

Option(A) Iron sulphate(${\mathrm{FeSO}}_4$):

• It is soluble in water and results in the formation of $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4^{}$.
• ${\mathrm{FeSO}}_4\left(\mathrm{s}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4\left(\mathrm{aq}\right)$

Option(B) Copper sulfate(${\mathrm{CuSO}}_4$):

• It is also soluble in water and results in the formation of ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$.
• ${\mathrm{CuSO}}_4\left(\mathrm{s}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to \left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4\left(\mathrm{aq}\right)$

Option(D) Carbon dioxide(${\mathrm{CO}}_2$):

• It is soluble in water and results in the formation of Carbonic acid(${\mathrm{H}}_2{\mathrm{CO}}_3$).
• ${\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{H}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)$.

Explanation for the incorrect option:

(C) Iron nail(Fe):

• It is not soluble in water.

Therefore, the correct options are (A), (B), and (D).