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

If travelling at same speeds, which of the following matter waves have the shortest wavelength?

Which of the following will not show deflection from the path on passing through an electric field?

A hypothetical electromagnetic wave is shown in Figure. Find out the wavelength of the radiation.

What is photoelectric effect? State the result of photoelectric effect experiment that could not be explained on the basis of laws of classical physics. Explain this effect on the basis of quantum theory of electromagnetic radiations.

Which of the following have no unit?

(i) Electronegativity

(ii) Electron gain enthalpy

(iii) Ionisation enthalpy

(iv) Metallic character

Explain the following:

Electronegativity of elements increase on moving from left to right in the periodic table.

If the electronic configuration of an element is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s², the four electrons involved in chemical bond formation will be ______.

Why does type of overlap given in the following figure not result in bond formation?

Briefly describe the valence bond theory of covalent bond formation by taking an example of hydrogen. How can you interpret energy changes taking place in the formation of dihydrogen?

The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen?

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound ______.

Standard molar enthalpy of formation, ∆_fH^Θ is just a special case of enthalpy of reaction, ∆_rH^Θ. Is the ∆_rH^Θ for the following reaction same as ∆_fH^Θ? Give reason for your answer.

\[\ce{CaO(s) + CO2(g) -> CaCO3(s); ∆_fH^Θ = - 178.3 kJ mol^{-1}}\]

The enthalpy of reaction for the reaction: \[\ce{2H2 (g) + O2(g) -> 2H2O (l)}\] is ∆_rH^Θ = – 572 kJ mol^–1. What will be standard enthalpy of formation of \[\ce{H2O (l)}\]?

Write a relation between ∆G and Q and define the meaning term and answer the following:

Why a reaction proceeds forward when Q < K and no net reaction occurs when Q = K.

Write a relation between ∆G and Q and define the meaning term and answer the following:

Explain the effect of increase in pressure in terms of reaction quotient Q. for the reaction: \[\ce{CO (g) + 3H2 (g) ⇌ CH4 (g) + H2O (g)}\]

Why does \[\ce{H+}\] ion always get associated with other atoms or molecules?

Hydrogen peroxide is ______.

Hydrogen peroxide is obtained by the electrolysis of ______.

Which of the following statement(s) is/are correct in the case of heavy water?

(i) Heavy water is used as a moderator in nuclear reactor.

(ii) Heavy water is more effective as solvent than ordinary water.

(iii) Heavy water is more associated than ordinary water.

(iv) Heavy water has lower boiling point than ordinary water.

How is heavy water prepared? Compare its physical properties with those of ordinary water.