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

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.

Give reasons for the following:

CCl₄ is immiscible in water, whereas SiCl₄ is easily hydrolysed.

Explain the following:

Silicon forms \[\ce{SiF^{2-}6}\] ion whereas corresponding fluoro compound of carbon is not known.

Explain the following:

CO₂ is a gas whereas SiO₂ is a solid.

Explain the following:

Silicon forms \[\ce{SiF^{2-}6}\] ion whereas corresponding fluoro compound of carbon is not known.

The +1 oxidation state in group 13 and +2 oxidation state in group 14 becomes more and more stable with increasing atomic number. Explain.

Carbon and silicon both belong to the group 14, but inspite of the stoichiometric similarity, the dioxides, (i.e., carbon dioxide and silicon dioxide), differ in their structures. Comment.

Explain the following:

Carbon shows catenation property but lead does not.

Explain the following:

BF₃ does not hydrolyse.

Explain the following:

Why does the element silicon, not form a graphite like structure whereas carbon does.

A tetravalent element forms monoxide and dioxide with oxygen. When air is passed over heated element (1273 K), producer gas is obtained. Monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and reduction of ferric oxide with the monoxide.

Which of the following is the correct IUPAC name?

The IUPAC name for

Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?

(i) \[\ce{CH4 (g) + 2O2 (g) -> CO2 (g) + 2H2O (l)}\]

(ii) \[\ce{CH4 (g) + O2 (g) -> C (s) + 2H2O (l)}\]

(iii) \[\ce{CH4 (g) + O2 (g) ->[Mo2O3] HCHO + H2O}\]

(iv) \[\ce{2CH4 (g) + O2 (g) ->[Cu/523 /100 atm] 2CH3OH}\]

Match the reactions given in Column I with the reaction types in Column II.

The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

An alkene ‘A’ contains three \[\ce{C - C}\], eight \[\ce{C - H}\] σ bonds and one \[\ce{C - C}\] π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of ‘A’.