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

Name the classes of hydrides to which \[\ce{H2O, B2H6}\] and \[\ce{NaH}\] belong.

What do you understand by the term ‘auto protolysis of water’ ? What is its significance?

Molecular hydrides are classified as electron-deficient, electron precise and electron-rich compounds. Explain each type with two examples.

Hydrogen generally forms covalent compounds. Give reason.

An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with \[\ce{Al2Cl6}\].

The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.

Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is ______.

When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ______.

Identify the correct formula of halides of alkaline earth metals from the following.

(i) BaCl₂.2H₂O

(ii) BaCl₂.4H₂O

(iii) CaCl₂.6H₂O

(iv) SrCl₂.4H₂O

Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate.

Discuss the trend of the following:

Thermal stability of carbonates of Group 2 elements.

Discuss the trend of the following:

The solubility and the nature of oxides of Group 2 elements.

Why are BeSO4 and MgSO₄ readily soluble in water while CaSO₄, SrSO₄ and BaSO₄ are insoluble?

What is the structure of BeCl₂ molecule in gaseous and solid state?

Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.

Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.

Which of the following is a Lewis acid?

Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order:

The reason for small radius of Ga compared to Al is:

(i) poor screening effect of d and f orbitals.

(ii) increase in nuclear charge.

(iii) presence of higher orbitals.

(iv) higher atomic number.

The linear shape of CO₂ is due to:

(i) sp³ hybridisation of carbon.

(ii) sp hybridisation of carbon.

(iii) pπ – pπ bonding between carbon and oxygen.

(iv) sp² hybridisation of carbon.