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

Write IUPAC name of the following compound:

CH₃CH = C(CH₃)₂

In the alkane H₃C–CH₂–C(CH₃)₂–CH₂–CH(CH₃)₂, identify 1°,2°,3° carbon atoms and give the number of H atoms bonded to each one of these.

A sample of pure PCl₅ was introduced into an evacuated vessel at 473 K. After equilibrium was attained, the concentration of PCl₅ was found to be 0.5 × 10^–1 mol L^–1. If the value of K_c is 8.3 × 10^–3, what are the concentrations of PCl₃ and Cl₂ at equilibrium?

\[\ce{PCl5 (g) ⇌ PCl3 (g) + Cl2(g)}\]

At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO₂ in equilibrium with solid carbon has 90.55% CO by mass

\[\ce{C (s) + CO2 (g) ⇌ 2CO (g)}\]

Calculate K_c for this reaction at the above temperature.

For the following bond cleavages, use curved arrows to show the electron flow and classify homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

\[\ce{CH3O - OCH3 -> CH3\overset\bullet{\text{O}} + \overset\bullet{\text{O}}CH3}\]

For the following bond cleavages, use curved-arrows to show the electron flow and classify as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

For the following bond cleavages, use curved-arrows to show the electron flow and classify as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

For the following bond cleavages, use curved-arrows to show the electron flow and classify as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

Which of the following carbocation is most stable?

The equilibrium constant for the following reaction is 1.6 ×10⁵ at 1024K

\[\ce{H2(g) + Br2(g) ⇌ 2HBr(g)}\]

Find the equilibrium pressure of all gases if 10.0 bar of HBr is introduced into a sealed container at 1024K.

Describe the structure of the common form of ice.

Among the elements \[\ce{B, Al, C}\] and \[\ce{Si}\], which element has the most metallic character?

Arrange the elements \[\ce{N, P, O}\] and \[\ce{S}\] in the order of increasing non metallic character. Give reason for the arrangement assigned.

Among alkali metals which element do you expect to be least electronegative and why?

What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of \[\ce{O - H}\] bond in ethanol \[\ce{(C2H5OH)}\] and water?

The variation of pressure with volume of the gas at different temperatures can be graphically represented as shown in figure.

On the basis of this graph answer the following questions.

(i) How will the volume of a gas change if its pressure is increased at constant temperature?

(ii) At a constant pressure, how will the volume of a gas change if the temperature is increased from 200 K to 400 K?

Match the following gas laws with the equation representing them.

We know that the relationship between K_c and K_p is K_p = K_c (RT)^∆n What would be the value of ∆n for the reaction \[\ce{NH4Cl (s) ⇌ NH3 (g) + HCl (g)}\]

Why do beryllium and magnesium not impart colour to the flame in the flame test?