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# NEET Chemistry Solved Question Paper 2006

#### Multiple Choice Questions

1.

Which of the following is not a property of liquid state ?

• Intermolecular force of attraction in a liquid is quite large

• All liquids accompanied by cooling on evaporation

• Lower the boiling point of a liquid, greater is its vapour pressure at room temperature

• A liquid boils at high temperature at the top of a mountain than at the sea level

D.

A liquid boils at high temperature at the top of a mountain than at the sea level

Among all the given options, option d is incorrect. We know that boiling point falls on decreasing the pressure. At mountain air pressure is low so liquid boils at lower temperature at the top of mountain than at the sea level.

2.

Given pH of a solutionA is 3 and it is mixed with another solution B having pH 2. If both mixed, then resultant pH of the solution will be :

• 3 : 2

• 1 : 9

• 3 : 4

• 3 : 5

B.

1 : 9

Given,

pH of A = 3 and pH of B = 2

$\therefore$ [H+] of A = 10-3 M and [H+] of B = 10-2 M

Total [H+

= 10-3 + 10-2

= 10-3 + 10 x 10-3 = 11 x 10-3

$\therefore$ - log10[H+] = - log(11 x 10-3)

= 3 - log 11

= 3 - 1.04

= 1.96

3.

The geometry of Ni(CO)4 and Ni(PPh3)2Cl2 are:

• both square planar

• tetrahedral and square planar respectively

• both tetrahedral

• square planar and tetrahedral respectively

C.

both tetrahedral

Ni(CO)4 and Ni(PPh3)2Cl2 are tetrahedral in geometrical shape, because co-ordination number of Ni is 4 in both cases.

4.

What will be the order of Ist ionisation energy?

• Li > Na > K

• K > Li > Na

• Na > Li > K

• Li > K > Na

A.

Li > Na > K

In a sub-group ionisation energy decreases from top to bottom because atomic size increases. So, the Ist Ionisation Energy of Li, Na and K are in the order

Li > Na > K

5.

If for a sucrose solution, elevation in boiling point is 0.1°C, then what will be the boiling point of NaCl solution for same molal concentration ?

• 0.1$°$C

• 0.2$°$C

• 0.08$°$C

• 0.01$°$C

B.

0.2$°$C

Elevation in boiling point is a colligative property as it depends upon the number of particles.

For sucrose, n = 1; $∆$Tb = 0.1$°$C

For NaCl, n = 2; $∆$T= 0.2$°$C

6.

With which of the given pairs CO2 resembles ?

• HgCl2, C2H2

• HgCl2, SnCl4

• C2H2, NO2

• N2O, NO2

A.

HgCl2, C2H2

CO2, HgCl2 and C2H2 all are linear in shape. Therefore,

CO- O = C = O

HgCl- Cl - Hg - Cl

C2H- HC $\equiv$CH

7.

Which of the following have maximum number of unpaired electrons ?

• Fe3+

• Fe2+

• Co2+

• Co3+

A.

Fe3+

Fe3+ has maximum number of unpaired electrons, i.e. 5

Fe3+ $\to$ [Ar]3d54s0

8.

A + B $⇌$ C + D. If initially the concentration of A and B are both equal but at equilibrium, concentration of D will be twice of that of A, then what will be the equilibrium constant of reaction?

• 4/9

• 9/4

• 1/9

• 4

D.

4

The equilibrium constant of the given reaction is 4.

9.

If magnetic quantum number of a given atom represented by -3, then what will be its principal quantum number ?

• 2

• 3

• 4

• 5

C.

4

Given, Magnetic quantum number or m = 3

$\because$ For, m = 3

l  = 3 and n = 4

10.

Which of the following have highest electron affinity?

• F

• Cl

• N

• O

B.

Cl

Electron affinity of halogens is maximum in a period and it decreases in a group from top to bottom but the EA of chlorine is greater than fluorine due to smaller atomic size of fluorine.