Solubility of alkaline earth metal sulphates in water decreases in the sequence:

1. Mg > Ca > Sr >Ba
2. Ca > Sr > Ba > Mg
3. Sr > Ca > Mg > Ba
4. Ba > Mg > Sr > Ca

 An active ingredient in bleaching powder that aids in the bleaching action is:

1.  $\mathrm{Ca}{\left(\mathrm{OCl}\right)}_2$

2.  ${\mathrm{CaO}}_2\mathrm{Cl}$

3.  ${\mathrm{CaCl}}_2$

4.  ${\mathrm{CaOCl}}_2$

A compound that has higher hydration enthalpy than the lattice enthalpy is: 

1. ${\mathrm{CaSO}}_4$

2. ${\mathrm{BeSO}}_4$

3. ${\mathrm{BaSO}}_4$

4. ${\mathrm{SrSO}}_4$

A compound that releases CO₂ most easily upon heating is?
1. $K_{2}C{O}_3$
2. $N{a}_{2}C{O}_3$
3. $MgC{O}_3$
4. $CaC{O}_3$

The most acidic oxide among the following is - 
1. MgO
2. BeO
3. BaO
4. CaO

The commercial method of preparation of potassium by reduction of molten KCl with metallic sodium at 850°C is based on the fact that -

1. Potassium is solid and sodium distils off at 850 °C.

2. Potassium is more volatile and distils off thus shifting the reaction forward.

3. Sodium is more reactive than potassium at 850 °C.

4. Sodium has less affinity to chloride ions in the presence of potassium ions.

A paramagnetic compound among the following is -

1. ${\mathrm{K}}_2\mathrm{O}$

2. ${\mathrm{K}}_2{\mathrm{O}}_2$

3. ${\mathrm{Na}}_2{\mathrm{O}}_2$

4. ${\mathrm{RbO}}_2$

The pair of compounds, that cannot exist together in a solution is -

1. ${\mathrm{NaHCO}}_3 \mathrm{and} \mathrm{NaOH}$

2. ${\mathrm{Na}}_2{\mathrm{CO}}_3 \mathrm{and} \mathrm{NaOH}$

3. ${\mathrm{NaHCO}}_3 \mathrm{and} {\mathrm{Na}}_2{\mathrm{CO}}_3$

4. ${\mathrm{NaHCO}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{O}$

$\left(\mathrm{Yellow} \mathrm{ppt}\right)\stackrel{{\mathrm{K}}_2{\mathrm{CrO}}_4}{\leftarrow }\mathrm{X}\stackrel{\mathrm{dil}. \mathrm{HCl}}{\to }$
$\left(\mathrm{Yellow} \mathrm{ppt}\right) +\mathrm{Z}\uparrow (\mathrm{pungent} \mathrm{smelling} \mathrm{gas})$

If X gives a green flame test, then X is:

1. ${\mathrm{MgSO}}_4$

2. ${\mathrm{BaS}}_2{\mathrm{O}}_3$

3. ${\mathrm{CuSO}}_4$

4. ${\mathrm{PbS}}_2{\mathrm{O}}_3$