Science (English Medium) Class 11 - CBSE Question Bank Solutions

Explain why is sodium less reactive than potassium?

Compare the alkali metals and alkaline earth metals with respect to (i) ionization enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides

Compare the solubility and thermal stability of the following compound of the alkali metals with those of the alkaline earth metals.

Nitrates

Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals.

Carbonates 

Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals.

Sulphates

Starting with sodium chloride how would you proceed to prepare sodium hydroxide.

Starting with sodium chloride how would you proceed to prepare sodium peroxide.

Starting with sodium chloride how would you proceed to prepare sodium carbonate?

The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain.

What happens when sodium peroxide dissolves in water?

Comment on the following observation:

The mobilities of the alkali metal ions in aqueous solution are Li⁺ < Na⁺ < K⁺ < Rb⁺ < Cs⁺

State as to why alkali metals are prepared by electrolysis of their fused chlorides?

How would you explain the following observation?

BeO is almost insoluble but BeSO₄ in soluble in water.

How would you explain the following observation?

 BaO is soluble but BaSO₄ is insoluble in water.

How would you explain the following observation?

LiI is more soluble than KI in ethanol.

Indicate the σ and π bonds in the following molecules:

C₆H₆

Indicate the σ and π bonds in the following molecules:

C₆H₁₂

Indicate the σ and π bonds in the following molecules:

CH₂Cl₂

Write bond line formulas for Isopropyl alcohol.

Write bond line formulas for 2,3-Dimethyl butanal.