The amount of Zinc (atomic weight = 65) necessary to produce 224 mL of H₂ (at STP) by the reaction with dilute sulphuric acid will be: 

On complete decomposition, the volume of CO₂ released at STP on heating 9.85 g of BaCO₃ (atomic mass, Ba = 137) will be:

1. 1.12 L

2. 4.84 L

3. 2.12 L

4. 2.06 L

ln a closed vessel, 50 ml of $A_2{B}_3$ completely reacts with 200 ml of C₂ according to the following equation:

$2A_2{B}_3\left(g\right)<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>5C_2\left(g\right)\to <mspace\; width="1em"></mspace>3C_3{B}_2\left(g\right)+C{A}_4\left(g\right)$

What will be the composition of the gaseous mixture in the system?

1. 100 ml $C_2,<mspace\; width="1em"></mspace>50<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C_3{B}_2,50<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C{A}_4$

2. 25 ml $C_2,<mspace\; width="1em"></mspace>75<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>C_3{B}_{\mathrm{2,}}<mspace\; width="1em"></mspace>25<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C{A}_4$

3. 75 ml $C_2,<mspace\; width="1em"></mspace>75<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C_3{B}_{2,<mspace\; width="1em"></mspace>}25<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C{A}_4$

4. 10 ml $C_2,<mspace\; width="1em"></mspace>25<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C_3{B}_{2,<mspace\; width="1em"></mspace>}100<mspace\; width="1em"></mspace>ml<mspace\; width="1em"></mspace>C{A}_4$

In a reaction A + B₂ → AB_2, 
A will act as a limiting reagent if :

 
Choose the correct option: