11.

The heat is liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25 °C and it increases the temperature of 18.94 kg of water by 0.632 °C. If the specific heat of water at 25 °C is 0.998 cal/g-deg, then value of the heat of combustion of benzoic acid is

• 881.1 kcal

• 981.1 kcal

• 771.1 kcal

• 871.2 kcal

Assertion : trans-Pent-2-ene is polar but trans- but-2-ene is non-polar.

Reason : The polarity of cis-isomer is more than trans-isomer, which are either non-polar or less polar.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false

Assertion : The number of tetrahedral voids is double the number of octahedral voids.

Reason : The size of the tetrahedral voids is half of that of the octahedral void.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : The second dissociation constant of fumaric acid is greater than maleic acid.

Reason : Higher the dissociation constant of acid, more is the acidic character.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both assertion and reason are false

Assertion : [Fe(CN)₆]^3- has d²sp³ type hybridisation.

Reason: [Fe(CN)₆]^3- ion shows magnetic moment corresponding to two unpaired electrons.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion: Both $\mathrm{\pi }$(2p_x) and $\mathrm{\pi }$^*(2p_x) MO's have one nodal plane.

Reason : All MO's formed by side way overlapping of 2p- orbitals have one nodal plane.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Spontaneous process is an irreversible process and may be reversed by some external agency.

Reason : Decrease in enthalpy is a contributory factor for spontaneity.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.

H₂O is polar, whereas BeF₂ is not because

• electronegativity of F is greaterthan that of O.

• H₂O involves H-bonding, whereas BeF₂ is a discrete molecule

• H₂O is angular and BeF₂ is linear

• H₂O is linear and BeF₂ is angular.

The correct order of solubility ofthe following compounds in water is

• Ba(OH)₂ < Mg(OH)₂

• BaCO₃ > CaCO₃

• Ca(OH)₂ $\simeq$ Mg(OH)₂

• CaSO₄ < MgSO₄

(R)-2-Iodobutane is treated with NaI in acetone and allowed to stand for a long time. The product eventually formed is

• (R)-2-iodobutane

• (S)-2-iodobutane

• (±)-2-iodobutane

• (±)-1, 2-diiodobutane