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

A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.

What happens when equilibrium is restored finally and what will be the final vapour pressure?

At a certain temperature and total pressure of 10⁵ Pa, iodine vapour contains 40% by volume of I atoms

\[\ce{I2(g) <=> 2I(g)}\]

Calculate K_pfor the equilibrium.

Explain why pure liquids and solids can be ignored while writing the equilibrium constant expression?

Explain tropospheric pollution in 100 words.

Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?

List gases which are responsible for greenhouse effect.

Statues and monuments in India are affected by acid rain. How?

What would have happened if the greenhouse gases were totally missing in the earth’s atmosphere? Discuss.

How can you explain higher stability of BCl₃ as compared to TlCl₃?

Suggest reasons why the B–F bond lengths in BF₃ (130 pm) and `"BF"_4^(-)` (143 pm) differ.

Aluminium trifluoride is insoluble in anhydrous HF but dissolves on the addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous BF₃ is bubbled through. Give reasons.

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