An alkaline earth metal sulphate that has hydration enthalpy higher than the lattice enthalpy is -

1. CaSO₄               

2. BeSO₄

3. BaSO₄               

4. SrSO₄

Property of the alkaline earth metals that increases with their atomic number is -

1. Solubility of their hydroxides in water.

2. Solubility of their sulphates in water.

3. Ionisation energy.

4. Electronegativity.

In the case of alkali metals, the covalent character decreases in the order

1. MCl>MI>MBr>MF

2. MF>MCl>MBr>MI

3. MF>MCl>MI>MBr

4. MI>MBr>MCl>MF

The thermal stability of these hydrides decreases in which of the following orders?

(1) CsH > RbH > KH > NaH > LiH

(2) KH > NaH > LiH > CsH > RbH

(3) NaH > LiH > KH > RbH > CsH

(4) LiH > NaH > KH > RbH > CsH

Which of the following compounds has a positive enthalpy of solution?

(1) LiF                                       

 (2) LiCl

(3) LiBr                                       

(4) Lil

An active ingredient in bleaching powder for bleaching action is -

1. Ca(OCl)₂             

2. CaO₂Cl

3. CaCl₂                 

4. CaOCl₂

A compound that releases CO₂ most easily upon heating is -

1. K₂CO₃                                 

2. Na₂CO₃

3. MgCO₃                                 

4. CaCO₃

"Metals are usually not found as nitrates in their ores'"

Out of the following two (I and II) reasons which is/are true for the above observation?

I. Metal nitrates are highly unstable.

II. Metal nitrates are highly soluble in water.

1. I and ll are true 

2. I and II are false

3. I is false but ll is true

4. l is true but ll is tase

Which of the following metal on burning in moist air does not give the smell of ammonia?

1. Mg                               

2. Ca

3. K                                 

4. Li

Among the carbonates of alkali metals which one has highest thermal stability?

(1) $C{s}_{2}C{O}_3$                 

(2) $R{b}_{2}C{O}_3$                     

(3) $K_{2}C{O}_3$                   

(4) $N{a}_{2}C{O}_3$