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NEET Chemistry Solved Question Paper 2011

Multiple Choice Questions

11.
25 mL, 0.2 M Ca(OH)₂ is neutralised by 10 mL of 1 M HCI. Then pH of resulting solution is

1.37

9

12

7

Number of millimoles of Ca(OH)₂ = N₁V₁ = 2 $\times$ N₁ $\times$ V₁ = 2 $\times$ 0.2 $\times$ 25 = 10

Number of millimoles of HCl = N₂V₂ = 10 $\times$ 1 = 10

As, no. of millimoles of Ca(OH)₂ = no. of millimoles of base

$∴$ Acid is completely neutralised by base forming a neutral solution.

Therefore, pH of the resulting solution is 7.

12.

Assertion : AgCl is more soluble in NH₃ than in water.

Reason : Ammonia is more polar than water.

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

If assertion is true but reason is false

Solubility of AgCl (at 25 $°$ C) in H₂O = 0.0020 gm AgCl per litre of H₂O

Solubility of AgCl in NH₃ (at 25 $°$ C) = 14.00 gm AgCl dissolved per kg of NH₃

Ammonia is less polar than water, as oxygen is more electronegative than nitrogen.

13.

For a first order gas phase reaction-

A_(g) $\to$ 2B_(g)+ C_(g)

P₀ be initial pressure of A and P, the total pressure at time 't'. Integrated rate equation is

$\frac{2.303}{t} \log (\frac{P_{0}}{P_{0} - P_{t}})$
$\frac{2.303}{t} \log (\frac{2 P_{0}}{3 P_{0} - P_{t}})$
$\frac{2.303}{t} \log (\frac{P_{0}}{2 P_{0} - P_{t}})$
$\frac{2.303}{t} \log (\frac{2 P_{0}}{2 P_{0} - P_{t}})$

$\frac{2.303}{t} \log (\frac{2 P_{0}}{3 P_{0} - P_{t}})$

$\underset{Initial}{} \underset{P_{0} - P}{\underset{P_{0}}{A_{(g)}}} \to \underset{2 P}{\underset{0}{2 B_{(g)}}} + \underset{P}{\underset{0}{C_{(g)}}}$

Total pressure at time (t) = P₀ - P + 2P + P = P_t

$\Rightarrow$ P_t = P₀ + 2P

$\Rightarrow$ P_t - P₀ = 2P

$\Rightarrow$ P = $\frac{P_{t} - P_{0}}{2}$

$k = \frac{2.303}{t} \log [\frac{P_{0}}{P_{0} - P}] = \frac{2.303}{t} \log [\frac{P_{0}}{P_{0} - (\frac{P_{t} - P_{0}}{2})}] = \frac{2.303}{t} \log (\frac{2 P_{0}}{2 P_{0} - P_{t} + P_{0}}) = \frac{2.303}{t} \log (\frac{2 P_{0}}{3 P_{0} - P_{t}})$

14.

Assertion : R₃P=O exists but R₃N=O does not exist.

Reason : P is more electronegative than N.

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.

If assertion is true but reason is false

R₃P=O exists but R₃N=O does not exist, this is because electronegativity of N (3.0) is much higher than P (2.1).

15.

Which of the following is intensive property?

Enthalpy
Entropy
Specific heat
Volume

Specific heat

Intensive property in thermodynamics is independent of the amount of mass. Specific heat is an intensive property.

Extensive property in thermodynamics varies directly with mass. It includes enthalpy, entropy and volume.

16.

The number of $σ$ - and $π$ -bonds present in pent-4-ene-1-yne is

10, 3
4, 9
3, 10
9, 4

10, 3

Pent-4-ene-1-yne

$\overset{1}{C} H \equiv \overset{2}{C} - \overset{3}{C} H_{2} - \overset{4}{C} H = \overset{5}{C} H_{2}$

No. of $σ$ bonds - 4 (C - C) + 6 (C - H) = 10

No. of $π$ bonds - 1 (C = C) + 2 (C $\equiv$ C) = 3

17.

Assertion : H₂S is less acidic than H₂Te.

Reason : Te has larger, radius than S.

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.

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

H₂S is less acidic than H₂Te because as the size of the atom S in H₂S increases, the strength of the H - M bond decreases.

18.

Assertion : A reaction is spontaneous if E_cell= +ve.

Reason : For E_cell= +ve, $∆$ G is always -ve.

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

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

For a redox reaction to be spontaneous, the EMF of the cell must be positive.

As, - $∆$ G = nFE_cell

Therefore, for E_cell = +ve, $∆$ G is always negative.

19.

Which of the following is not a thermodynamic function?

Internal energy
Work done
Enthalpy
Entropy

Work done

Thermodynamic functions include internal energy whose change can be expressed in terms of heat and work; enthalpy, entropy, pressure, volume, temperature, free energy, number of moles.

20.

Assertion : Helium is used in diving apparatus.

Reason : Solubility of helium is less in blood.

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.

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

A mixture of 2% O₂ and 98% He is used in diving apparatus which gives the same partial pressure of O₂ as in normal air at 1 atm. Due to high partial pressure and greater solubility, N₂ gets dissolved in blood and form bubbles (bends or decompression sickness). Hence, N₂is replaced by helium which is much less soluble in biological fluids.