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# NEET Chemistry Solved Question Paper 2008

#### Multiple Choice Questions

1.

A gas mixture contains O2 and N2 in the ratio of 1 : 4 by weight. The ratio of their number of molecules is

• 1 : 8

• 1 : 4

• 3 : 16

• 7 : 32

D.

7 : 32

The ratio of Oand N2 by weight is 1: 4

Therefore, the ratio of O2 and N2 by moles =

= 7 : 32

Hence, the ratio of the number of molecules is 7 : 32.

2.

The change in entropy for the fusion of 1 mole of ice is [mp of ice = 273 K, molar enthalpy of fusion for ice= 6.0 kJ mol-1]

• 11.73 JK-1 mol-1

• 18.84 JK-1 mol-1

• 21.97 JK-1 mol-1

• 24.47 JK-1 mol-1

C.

21.97 JK-1 mol-1

Entropy change of fusion

= 60 x 103 JK mol-1; T = 273 K

3.

BaO2 and ozone reacts to produce

• Ba

• Ba2O3

• BaO

• Ba(OH)3

C.

BaO

BaO2 and ozone reacts to produce BaO and oxygen.

BaO2 + O3 $\to$ BaO + 2O2

4.

Neutron is discovered by

• Rutherford

• Yukawa

• Dalton

A.

Neutrons are the particles in an atom that have a neutral charge. These particles were discovered by Chadwick.

5.

The de-Broglie wavelenght of a particle with mass 1 kg and velocity 100 m/s is

• 6.6 x 10-33 m

• 6.6 x 10-36 m

• 3.3 x 1033 m

• 3.3 x 10-36 m

B.

6.6 x 10-36 m

The de broglie wavelength of a particle with mass 1 kg and velocity 100 m/s is 6.6 x 10-36 m.

=

= 6.6 x 10-36 m

# 6.The most stable compound isLiF LiCl LiBr LiI

A.

LiF

The electronegativity of halogen is as :

F > Cl >  Br > I

Among alkali metals the electropositive character increases as :

Li < Na < K < Rb < Cs

Hence, LiF is the most stable compound.

7.

The volume of a gas measured at 27$°$C and 1 atm pressure is 10 L. To reduce the volume to 2 L at 1 atm pressure, the temperature required is

• 60 K

• 75 K

• 150 K

• 225 K

A.

60 K

Here, V1 = 10 L; V2 = 2 L

p1 = 1 atm; p2 = 1 atm

T1 = 300 K; T2 = x

8.

Heisenberg uncertainty principle can be explained as

B.

According to Heisenberg uncertainty principle, the product of uncertainty in momentum ($∆$P) and in position ($∆$x) remains constant. Therefore, it can be explained using the following formula

9.

When copper reacts with hot and conc. H2SO4 gives

• H2

• N2

• O2

• SO2

D.

SO2

When copper reacts with hot and conc. H2SO4, SO2 is produced.

Cu + 2H2SO4 $\to$ CuSO4 + SO2 + 4H2O

10.

What is X in the following nuclear reaction?

7N141H1 $\to$8O15 + X

• 0n1

• -1e0

• +1e0

• $\mathrm{\gamma }$

D.

$\mathrm{\gamma }$

X in the following reaction is gamma.

7N141H1 $\to$ 8O15$\mathrm{\gamma }$