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:

$2A_2{B}_3\left(g\right) + 5C_2\left(g\right)\to 3C_3{B}_2\left(g\right)+C{A}_4\left(g\right)$

The composition of the gaseous mixture in the system will be:

1. 100 ml $C_2, 50 ml C_3{B}_2,50 ml C{A}_4$

2. 25 ml $C_2, 75 ml C_3{B}_{\mathrm{2,}} 25 ml C{A}_4$

3. 75 ml $C_2, 75 ml C_3{B}_{2, }25 ml C{A}_4$

4. 10 ml $C_2, 25 ml C_3{B}_{2, }100 ml C{A}_4$

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

Choose the correct option:

To produce 20 moles of ammonia via Haber's process, how many moles of hydrogen molecules are required?