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

What is hybridization state of each carbon atom in the following compound?

(CH₃)₂CO

What is hybridization state of each carbon atom in the following compound?

CH₂ = CHCN

Consider the isoelectronic species, \[\ce{Na+, Mg^{2+}, F–}\] and \[\ce{O2-}\]. The correct order of increasing length of their radii is ______.

Choose the correct order of atomic radii of fluorine and neon (in pm) out of the options given below and justify your answer.

What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.

Match the items given in Column I with examples given in Column II.

Assertion (A): Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.

Reason (R): This is because sodium and chloride ions acquire octet in sodium chloride formation.

For real gases the relation between p, V and T is given by van der Waals equation:

`p + (an^2)/V^2 (V - nb) = nRT`

where ‘a’ and ‘b’ are van der Waals constants, ‘nb’ is approximately equal to the total volume of the molecules of a gas. ‘a’ is the measure of magnitude of intermolecular attraction.

Arrange the following gases in the increasing order of ‘b’. Give reason.

\[\ce{O2, CO2, H2, He}\]

For real gases the relation between p, V and T is given by van der Waals equation:

`p + (an^2)/V^2 (V - nb) = nRT`

where ‘a’ and ‘b’ are van der Waals constants, ‘nb’ is approximately equal to the total volume of the molecules of a gas. ‘a’ is the measure of magnitude of intermolecular attraction.

Arrange the following gases in the decreasing order of magnitude of ‘a’. Give reason.

\[\ce{CH4, O2, H2}\]

Which of the following statements is correct?

In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.

In an exothermic reaction, heat is evolved, and system loses heat to the surrounding. For such system:

(i) q_p will be negative

(ii) ∆_rH will be negative

(iii) q_p will be positive

(iv) ∆_rH will be positive

Heat has randomising influence on a system and temperature is the measure of average chaotic motion of particles in the system. Write the mathematical relation which relates these three parameters.

Increase in enthalpy of the surroundings is equal to decrease in enthalpy of the system. Will the temperature of system and surroundings be the same when they are in thermal equilibrium?

Predict the change in internal energy for an isolated system at constant volume.

Although heat is a path function but heat absorbed by the system under certain specific conditions is independent of path. What are those conditions? Explain.

Match Column (I) with Column (II).

E^Θ values of some redox couples are given below. On the basis of these values.

E^Θ values: \[\ce{Br2 /Br- = + 1.90; Ag+ / Ag(s) = + 0.80}\];

\[\ce{Cu^{2+} / Cu(s) = + 0.34; I2(s) / I- = 0.54}\]

Consider the reactions

(A) \[\ce{H2O2 + 2HI -> I2 + 2H2O}\]

(B) \[\ce{HOCl + H2O2 -> H3O+ + Cl- + O2}\]

Which of the following statements is correct about \[\ce{H2O2}\] with reference to these reactions? Hydrogen perioxide is ______.

Elements of which of the following group(s) of periodic table do not form hydrides.