Question

Consider the following statements.

1. If all the reactants are not taken in their stoichiometric ratio, then at least one reactant will be left behind.

2. 2 moles of $H_2\left(g\right)$ and 3 moles of $O_2\left(g\right)$ produce 2 moles of water.

3. If equal weights of carbon and oxygen are taken to produce $C{O}_2$, then $O_2$ is limiting reagent.

The above statements 1, 2, 3 respectively are (T = True, F = False):

• A. TTT
• B. FTF
• C. FFF
• D. TFT

Answer 1

The correct option is A TTT

• If all the reactants are not taken in their stoichiometric ratio, then at least one reactant will be left behind because if reactants are not in a stoichiometric ratio then one reactant will be limiting agent and reaction will stop.

• ${2H}_2+{3O}_2⟶{2H}_{2}O$ ( 2 moles of $O_2$ will be left behind as $H_2$ is the limiting reagent)

• $C+O_2⟶{CO}_2$

If the equal weight of Carbon and Oxygen is taken then Oxygen will be left behind as the molecular weight of Oxygen is greater than the molecular weight of Carbon. Therefore, the moles of Carbon will be greater than the moles of Oxygen.

Hence, all three statements are true.