The number of  moles  present in 2.5 litres of 0.2 M  ${\mathrm{H}}_2{\mathrm{SO}}_4$ are:

1. 0.25

2. 0.5

3. 0.75

4. 0.2

The number of valence electrons present in 0.53 grams of Na₂CO₃ is:

1. $3.01\times {10}^{23}$

2. $7.22\times {10}^{22}$

3. $12.046\times {10}^{23}$

4. $6.023\times {10}^{23}$

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

 The maximum number of molecules is present in which of the following? 

1. 15 L of $H_2$ gas at STP

2. 5 L of $N_2$ gas at STP

3. 0.5 g of $H_2$ gas

4. 10 g of $O_2$ gas

If 4 g of NaOH dissolves in 36 g of H₂O, the molarity of the solution is: (specific gravity of solution is 1 g mL^-1) : 

On complete combustion, 44 g of a sample of a compound gives 88 g CO₂ and 36 g of H₂O. The molecular formula of the compound may be:

1.  ${\mathrm{C}}_4{\mathrm{H}}_6$ $$

2.  ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$ $$

3.  ${\mathrm{C}}_2{\mathrm{H}}_4\mathrm{O}$

4.  ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$

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

Two students performed the same experiment separately, and each of them recorded two readings of mass, which are given below. The correct reading of mass is 3.0 g. On the basis of the given data, mark the correct option out of the following statements.

1. 1.5 M

2. 1.66 M

3. 0.017 M

4. 1.59 M