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

How can \[\ce{D2O}\] be prepared from water? Mention the physical properties in which \[\ce{D2O}\] differs from \[\ce{H2O}\]. Give at least three reactions of \[\ce{D2O}\] showing the exchange of hydrogen with deuterium.

Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?

The formula of soda ash is ______.

A chemical A is used for the preparation of washing soda to recover ammonia. When CO₂ is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to disinfectant nature. What is the chemical formula of A?

When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?

(i) H⁺ ions

(ii) Mg²⁺ ions

(iii) Ca²⁺ ions

(iv) \[\ce{SO^{2-}4}\] ions

Complete the following reactions.

\[\ce{O^{2-}2 + H2O ->}\]

Complete the following reactions.

\[\ce{O^{-}2 + H2O ->}\]

In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)₂CO₃ with sodium chloride? Explain.

Match the compounds given in Column I with their uses mentioned in Column II.

Match the elements given in Column I with the colour they impart to the flame given in Column II.

Boric acid is an acid because its molecule ______.

Draw the structures of BCl₃.NH₃ and AlCl₃ (dimer).

Explain the nature of boric acid as a Lewis acid in water.

Draw the structure of boric acid showing hydrogen bonding. Which species is present in water? What is the hybridisation of boron in this species?

When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature? Explain.

What are boranes? Give chemical equation for the preparation of diborane.

A compound (A) of boron reacts with NMe₃ to give an adduct (B) which on hydrolysis gives a compound (C) and hydrogen gas. Compound (C) is an acid. Identify the compounds A, B and C. Give the reactions involved.

The increasing order of reduction of alkyl halides with zinc and dilute HCl is ______.

Write the structures and names of products obtained in the reactions of sodium with a mixture of 1-iodo-2-methylpropane and 2-iodopropane.

Match the hydrocarbons in Column I with the boiling points given in Column II.