Question

Any gas evolved during a reaction is represented by an arrow pointing upward preceding the chemical formula.

• A. True
• B. False

Answer 1

The correct option is A True

• Any gas evolved during a reaction is represented by an arrow pointing upward preceding the chemical formula.
• Example - When zinc $\left(\mathrm{Zn}\right)$metal reacts with sulphuric acid, it forms zinc sulphate $\left({\mathrm{ZnSO}}_4\right)$ and hydrogen $\left({\mathrm{H}}_2\right)$gas is evolved.

$\underset{\mathrm{Zinc}}{\mathrm{Zn}\left(\mathrm{s}\right)}+\underset{\mathrm{Sulphuric}\mathrm{acid}}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}\to \underset{\mathrm{Zinc}\mathrm{sulphate}}{{\mathrm{ZnSO}}_4\left(\mathrm{s}\right)}+\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)(\uparrow )}$

Thus, the given statement is true.