On heating Li₂CO₃ and Na₂CO₃.10H₂O, residue is left after heating. The weight loss is due to

1. Evolution of CO₂ from Na₂CO₃.10H₂O only

2. Evolution of CO₂ from Li₂CO₃ only

3. Due to evolution of CO₂ from Li₂CO₃ and H₂O from Na₂CO₃.10H₂O 

4. H₂O from  Na₂CO₃.10H₂O 

Ionic mobility of which of the following alkali metal ions is lowest when an aqueous solution of their salts are put under an electric field?

(1) Na                       

(2) K

(3) Rb                       

(4) Li

The incorrect statement among the following regarding Beryllium is-

1. It is rendered passive by nitric acid.

2. lt forms Be₂C

3. It's salts rarely hydrolyze.

4. It's hydride is electron-deficient and polymeric.

The function of "Sodium pump" is a biological process operating in each and every cell of

all animals. Which of the following biologically important ions is also a constituent of this

pump?

1. Ca²⁺           

2. Mg²⁺         

3. K⁺           

4. Fe²⁺

"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

Solubility of the alkaline earth's 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 alkali metal that forms only normal oxide, M₂O on heating in air is -

1. Rb

2. K

3. Li

4. Na

An active ingredient in bleaching powder for bleaching action is -

1. Ca(OCl)₂             

2. CaO₂Cl

3. CaCl₂                 

4. CaOCl₂

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.