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Subject

Chemistry

Class

NEET Class 12

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NEET Chemistry Solved Question Paper 2011

Multiple Choice Questions

For adiabatic process, which is correct?

$∆$ T = 0
$∆$ S = 0
q = 0
q_p = 0

q = 0

Adiabatic process is a process that occurs without transfer of heat or mass of substances between a thermodynamic system and it surroundings. Therefore, q = 0

In the van der Waals equation, 'a' signifies

intermolecular attraction
intramolecular attraction
attraction between molecules and wall of container
volume of molecules

intermolecular attraction

In van der Waal's equation, a signifies the intermolecular force of attraction.

Smallest wavelength occurs for

Lyman series
Balmer series
Paschen series
Brackett series

Lyman series

Smallest wavelength occurs in Lyman series.

Wavelength increases from Lyman > Balmer > Paschen > Brackett > Pfund.

Which of the following is not hygroscopic?

CsCl
MgCl₂
CaCl₂
LiCl

CsCl

CsCl is not hygroscopic in nature while MgCl₂, CaCl₂ and LiCl are hygroscopic in nature.

K_sp of CaSO₄.5H₂O is 9 $\times$ 10^-6, find the volume for 1 g of CaSO₄ (M.wt. = 136).

2.45 litres
5.1 litres
4.52 litres
3.2 litres

2.45 litres

CaSO₄ (s) $⇌ \underset{S}{{Ca}^{2 +}} (aq) + \underset{S}{{SO}_{4}^{2 -}} (aq)$

K_sp = S² = 9 $\times$ 10^-6

S = 3 $\times$ 10^-3 mol L^-1

Solubility in g litre^-1 = molecular mass $\times$ S

= 136 $\times$ 3 $\times$ 10^-3 = 408 $\times$ 10^-3 g L^-1

408 $\times$ 10^-3 g of CaSO₄ present in 1 litre.

1 gm of CaSO₄ present is $\frac{1}{408 \times 10^{- 3}} = 2.45 litres$

Which of the following is not a characteristic of equilibrium?

Rate is equal in both directions
Measurable quantities are constant at equilibrium.
Equilibrium occurs in reversible condition.
Equilibrium occurs only in open vessel at constant temperature.

Equilibrium occurs only in open vessel at constant temperature.

Equilibrium state can only be achieved if a reversible reaction is carried out in a closed space.

Which of the following is wrong for Bohr model?

It establishes stability of atom
It is inconsistent with Heisenberg uncertainty principle.
It explains the concept of spectral lines for hydrogen like species.
Electrons behave as particle and wave

Electrons behave as particle and wave

Among all the given options, option d is wrong. It can be corrected as Bohr model does not explain de Broglie concept of the dual character of matter.

Predict the product of reaction of I₂ with H₂O₂ in basic medium

I^-
I₂O₃
IO $_{3}^{-}$
I $_{3}^{-}$

I^-

I^- is the product of reaction in basic medium.

I₂ (s) + H₂O₂ (aq) +2OH^- (aq) $\to$ 2I^- (aq) + 2H₂O (l) + O₂ (g)

Decreasing order of bond angle is

BeCl₂ > NO₂ > SO₂
BeCl₂ > SO₂ > NO₂
SO₂ > BeCl₂ > NO₂
SO₂ > NO₂ > BeCl₂

BeCl₂ > NO₂ > SO₂

Decreasing order of bond angle is BeCl₂ > NO₂ > SO₂.

Bond angle of BeCl₂, NO₂ and SO₂ is 180 $°$ , 132 $°$ and 119.5 $°$ respectively.

10.

The enthalpy of formation of CO_(g), CO_2(g), N₂O_(g), and N₂O_4(g) is -110, -393, +811 and 10 kJ/mol respectively. For the reaction, N₂O₄ + 3CO_(g) $\to$ N₂O_(g)+ 3CO_2(g); $∆$ H_r (kJ/mol) is

-212
+212
+48
-48

-48

N₂O₄(g)+ 3CO(g) $\to$ N₂O (g) + 3CO₂ (g)

$∆ H_{r e a c t i o n} = \sum_{Heat of formation of products} - \sum_{Heat of formation of reactants}$

${∆H}_{reaction} = [∆ H_{f} N_{2} O + 3 \times ∆ H_{f} {CO}_{2}] - [∆ H_{f} N_{2} O_{4} + 3 \times ∆ H_{f} CO] ∆ H_{r} = [+ 811 + 3 (- 393)] - [10 + 3 (- 110)]$