A mixture of ${\mathrm{MgCl}}_2$ and ${\mathrm{MgSO}}_4$ contains 0.6 moles of chloride ions and 0.2 moles of sulphate ions. 
What is the mole fraction of Mg²⁺ ions among all the ions present in the mixture?

1.  0.335

2.  $\frac{5}{13}$

3.  0.543

4.  $\frac{1}{3}$

Calculate the molecular mass of Lewisite, a tear gas, if each molecule contains 2 hydrogen atoms, 2 carbon atoms, 1.78 × 10⁻²² g of chlorine and 1.25 × 10⁻²² g of an unknown metal.

1.   178

2.   209

3.   245

4.  342

Find the value of x and y, respectively, if x L of 1 M HCl is mixed with 2 L of 2 M HCl to prepare y L of 1.5 M HCl.

1. 6, 4

2. 2, 4

3. 3, 4

4. 4, 2

A and B are two elements that form ${\mathrm{A}}_2{\mathrm{B}}_3$ and ${\mathrm{AB}}_2$. If 0.30 moles of  ${\mathrm{A}}_2{\mathrm{B}}_3$ weigh 31.8 g and 0.30 moles of  ${\mathrm{AB}}_2$ weigh 18.6 g. What are the atomic weights of A and B, respectively?

1.  18, 26

2.  9, 13

3.  26, 18

4.  26, 52

What volume of ammonia gas at NTP will be required to be passed into 30 mL of 1 $\mathrm{N}<mspace\; width="1em"></mspace>{\mathrm{H}}_2{\mathrm{SO}}_4$ to bring down the acid normality to 0.2 N?

1.  480.5 mL

2.  537.6 mL

3.   438.4 mL

4.  556.5 mL

${\mathrm{x}}_1$ ml solution having normality ${\mathrm{y}}_1$ is diluted to get a solution Of normality ${\mathrm{y}}_2$what would be volume required for dilution?

1.  $x_1(\frac{y_1}{y_2}-1)$

2.    $x_1(1-\frac{y_1}{y_2})$

3.  $x_1(\frac{y_2}{y_1}-1)$

4.  $x_1(1+\frac{y_1}{y_2})$

When 1.8 L of oxygen is passed through an ozonizer, the volume of the resulting mixture of ozone and oxygen is found to be 1.6 L. Calculate the mole fraction of ozone in the final mixture.

1.   0.15

2.   0.25

3.   0.40

4.   0.50

Calculate the percentage by mass of CaCl₂ in a 10.0 g sample of a mixture of calcium chloride and sodium chloride, if the sample is treated with Na₂CO₃ to precipitate calcium as CaCO₃. On heating, CaCO₃ is converted completely into CaO, and the final mass of CaO obtained is 1.62 g.

1.   15.2%

2.   32.1%

3.   21.8%

4.   11.07%

Find the interhalogen compound IClₓ when 1.625 g of the compound is subjected to electric discharge, producing constituents that occupy 224 mL at STP.

1. ICI

2. ${\mathrm{lCl}}_3$

3. ${\mathrm{lCl}}_5$

4. ${\mathrm{lCl}}_7$

Find the empirical formula of the compound formed when a 2 g sample of xenon
reacts with fluorine to produce 3.158 g of the compound.

1.  ${\mathrm{XeF}}_2$

2.  ${\mathrm{XeF}}_4$

3.  ${\mathrm{XeF}}_5$

4.  ${\mathrm{XeF}}_6$