Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

What happens when BF₃ is reacted with ammonia?

How would you explain the lower atomic radius of Ga as compared to Al?

In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.

What do you understand by inert pair effect?

Write a balanced equation for Al + NaOH → ?

Write a balanced equation for B₂H₆ + NH₃ → ?

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.