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

Which of the following pair of elements would have a more negative electron gain enthalpy?

F or Cl

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Describe the theory associated with the radius of an atom as it gains an electron.

Describe the theory associated with the radius of an atom as it loses an electron.

Discuss the shape of the following molecules using the VSEPR model:

BeCl₂, BCl₃, SiCl₄, AsF₅, H₂S, PH₃

Although geometries of NH₃ and H₂O molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.

Calculate the total number of electrons present in 1.4 g of dinitrogen gas.

Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm³ at 27°C. R = 0.083 bar dm³ K^–1 mol^–1.

2.9 g of a gas at 95 °C occupied the same volume as 0.184 g of dihydrogen at 17 °C, at the same pressure. What is the molar mass of the gas?

Write IUPAC name of the product obtained by the ozonolysis of the following compound.

Pent-2-ene

An alkene ‘A’ on ozonolysis gives a mixture of ethanal and pentan-3-one. Write structure and IUPAC name of ‘A’.

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

Propanal and pentan-3-one are the ozonolysis products of an alkene? What is the structural formula of the alkene?

Write a chemical equation for combustion reaction of the following hydrocarbon:

Butane

Write a chemical equation for combustion reaction of the following hydrocarbon: 

Pentene 

Write a chemical equation for combustion reaction of the following hydrocarbon:

Hexyne

Write a chemical equation for combustion reaction of the following hydrocarbon:

Toluene

Explain the following reaction.

Silicon dioxide is treated with hydrogen fluoride.

If the starting material for the manufacture of silicones is RSiCl₃, write the structure of the product formed.

Bromine monochloride, BrCl decomposes into bromine and chlorine and reaches the equilibrium:

\[\ce{2BrCl (g) ⇌ Br2 (g) + Cl2 (g)}\]

for which K_c= 32 at 500 K. If initially pure BrCl is present at a concentration of 3.3 × 10^–3 molL^–1, what is its molar concentration in the mixture at equilibrium?