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# NEET Chemistry Solved Question Paper 2014

#### Multiple Choice Questions

1.

A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 x 10-35 m. Hence, x is :

[h = 6.62 x 10-34Js]

• 0.1 Kg

• 0.25 Kg

• 0.15 Kg

• 0.2 Kg

A.

0.1 Kg

$\mathrm{\lambda }$ = $\frac{\mathrm{h}}{\mathrm{mv}}$

$\therefore$ m =

= 0.1 Kg

2.

0.5 mole of each of H2 , SO2 and CH4 are kept in a container. A hole was made in the container . After 3h , the order of partial pressures in the container will be :

• pSO2 > pH2 > pCH4

• pSO2 > PCH4 > pH2

• pH2 > pSO2 > pCH4

• pH2 > pCH4 > pSO2

B.

pSO2 > PCH4 > pH2

Rate of diffusion $\mathrm{\propto }$

$\therefore$ Order of diffusion H2 > CH4 > SO2

and amount left is in the order :
SO2 > CH4 > H2

Hence, order of partial pressure is
pSO2 > pCH4 > pH2

3.

The cooling in refrigerator is due to :

• the reaction of the refrigerator gas

• the expansion of ice

• the expansion of the gas in the refrigerator

• the work of the compressor

C.

the expansion of the gas in the refrigerator

This is based on Joule-Thomson effect.

4.

An evacuated glass vessel weighs 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g mL-1 and 50.5 g when filled with an ideal gas at 760 mm Hg and 300 K. The molar mass of the ideal gas is :

[R = 0.0821 L atm K-1 mol-1]

• 61.575

• 130.98

• 123.75

• 47.87

A.

61.575

Weight of empty glass vessel = 50 g
Weight of glass vessel filled with liquid = 144.0 g

$\therefore$Weight of liquid = 144- 50 = 94g
Density of liquid= 0.47 gmL-1

$\therefore$Volume of liquid = $\frac{94}{0.47}$ = 200mL = 0.2L

Mass of glass vessel filled with gas= 50.5 g

$\therefore$ Mass of gas (m) = 50.5- 50 = 0.5 g

By using ideal gas equation ,

pV = $\frac{\mathrm{m}}{\mathrm{W}}$RT

where , p= 760 mm, Hg= 1atm ,
V = 0.2 L , T = 300K ,
and      R = 0.0821 L atm K-1 mol-1

$\therefore$Molar mass (M) =$\frac{\mathrm{mRT}}{\mathrm{pV}}$

= 61.575g mol-1

5.

Pick out the incorrect statement from the following :

• sp hybrid orbitals are equivalent and are at an angle of 180° with each other

• sp2 hybrid orbitals are equivalent and bond angle between any two of them is 120°

• sp3dhybrid orbitals are equivalent and are oriented towards corners of a regular octahedron

• dsp2 hybrid orbitals are equivalent with a bond angle of 90° between the two atoms

D.

dsp2 hybrid orbitals are equivalent with a bond angle of 90° between the two atoms

Angle between any two dsp2 hybrid orbitals can be 90° or 180°

6.

A precipitate of AgCl is formed when equal volumes of the following are mixed :

[Ksp for AgCl = 10-10]

• 10-4 M AgNO3 and 10-7 M HCl

• 10-5 M AgNO3 and 10-6 M HCl

• 10-5 M AgNO3 and 10-4 M HCl

• 10-6 M AgNO3 and 10-6 M HCl

B.

10-5 M AgNO3 and 10-6 M HCl

For the precipitation of an electrolyte, it is necessary that the ionic product must exceed its solubility product. A precipitate of AgCl is formed when equal volumes of 10-5 M AgNOand 10-5 M HCl are mixed, because ionic product will be 10-9 which is greater than Ksp (10-10).

7.

A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is :

• 182

• 168

• 192

• 188

D.

188

Atomic mass of the metal = 32 x 2 = 64

Formula of metal nitrate= M(NO3)2

$\therefore$ Molecular mass = 64 + (14 + 3 x 16) x 2 = 188

8.

In an exothermic equilibrium ,

A + 3B $⇌$ AB3

all the reactants and products are in gaseous state. The formation of AB3 is favoured at :

• low temperature and low pressure

• low temperature and high pressure

• high temperature and high pressure

• high temperature and low pressure

B.

low temperature and high pressure

The given reaction is exothermic ($\mathrm{\Delta }$H < 0) and accompanied by decrease in the number of moles. Hence, it will be favoured by low temperature and high pressure.

9.

20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will :

• be neutral

• be basic

• turn phenolphthalein solution pink

• turn methyl orange red

C.

turn phenolphthalein solution pink

For 20 ml of 0.5 N HCl
N1V1 = 0.5 x 20 = 10
For 35 ml of 0.1 NaOH
N2V2 = 0.1x 35= 3.5

$\because$ N1V1 > N2V2

$\therefore$So!ution will be acidic in nature.
Due to acidic nature of solution, the colour of phenolphthalein becomes pink.

10.

The line spectrum of He+ ion will resemble that of :

• hydrogen atom

• Li+ ion

• helium atom

• lithium atom

A.

hydrogen atom

As hydrogen atom and He+ ion both have only one electron, hence the line spectrum of both will resemble.