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

Explain why BeH₂ molecule has a zero dipole moment although the Be–H bonds are polar.

What are the reactions involved for ozone layer depletion in the stratosphere?

Is boric acid a protic acid? Explain.

Explain what happens when boric acid is heated.

Explain the Structure of Boric Acid.

Explain the following reaction.

Hydrated alumina is treated with aqueous NaOH solution.

A certain salt X, gives the following results.

1. Its aqueous solution is alkaline to litmus.
2. It swells up to a glassy material Y on strong heating.
3. When conc. H₂SO₄ is added to a hot solution of X, white crystal of an acid Z separates out.

Write equations for all the above reactions and identify X, Y and Z.

Write a balanced equation for B₂H₆ + H₂O → ?

Write a balanced equation for NaH + B₂H₆ → ?

Write a balanced equation for \[\ce{H3BO3 ->[\Delta]}\]?

Boric acid is polymeric due to ______.

Find the oxidation state of sodium in Na₂O₂.

Discuss the various reactions that occur in the Solvay process.

Potassium carbonate cannot be prepared by Solvay process. Why?

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

Describe two important uses of each of the following caustic soda.

Describe two important uses of the following sodium carbonate.

What happens when sodium metal is dropped in water?

What happens when sodium metal is heated in the free supply of air?