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

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.

Rohan heard that instructions were given to the laboratory attendent to store a particular chemical i.e., keep it in the darkroom, add some urea in it, and keep it away from dust. This chemical acts as an oxidising as well as a reducing agent in both acidic and alkaline media. This chemical is important for use in the pollution control treatment of domestic and industrial effluents. Write the name of this compound.

Rohan heard that instructions were given to the laboratory attendent to store a particular chemical i.e., keep it in the darkroom, add some urea in it, and keep it away from dust. This chemical acts as an oxidising as well as a reducing agent in both acidic and alkaline media. This chemical is important for use in the pollution control treatment of domestic and industrial effluents. Write the name of this compound. Explain why such precautions are taken for storing this chemical.

What is the importance of heavy water?

Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein.

What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 mL of this solution.

Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding ______.

Me₃SiCl is used during polymerisation of organo silicones because:

(i) the chain length of organo silicone polymers can be controlled by adding Me₃SiCl.

(ii) Me₃SiCl blocks the end terminal of silicone polymer.

(iii) Me₃SiCl improves the quality and yield of the polymer.

(iv) Me₃SiCl acts as a catalyst during polymerisation.

Assertion (A): Silicons are water repelling in nature.

Reason (R): Silicons are organosilicon polymers, which have (–R₂SiO–) as repeating unit.

What are silicones? State the uses of silicones.

In which of the following representations given below spatial arrangement of group/ atom different from that given in structure ‘A’?

(A)

(i)
(ii)
(iii)
(iv)

What is the hybridisation of each carbon in H₂C = C = CH₂.

Show the polarisation of carbon-magnesium bond in the following structure.

CH₃ – CH₂ – CH₂ – CH₂ – Mg – X

Draw the possible resonance structures for \[\ce{CH3 - \overset{\bullet\bullet}{\underset{\bullet\bullet}{O}} - \overset{+}{C}H2}\] and predict which of the structures is more stable. Give reason for your answer.