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NEET Chemistry Solved Question Paper 2006

Multiple Choice Questions

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

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.

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

1 : 9

Given,

pH of A = 3 and pH of B = 2

$∴$ [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

$∴$ - log₁₀[H⁺] = - log(11 x 10^-3)

= 3 - log 11

= 3 - 1.04

= 1.96

Which of the following have maximum number of unpaired electrons ?

Fe³⁺
Fe²⁺
Co²⁺
Co³⁺

Fe³⁺

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

Fe³⁺ $\to$ [Ar]3d⁵4s⁰

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?

The equilibrium constant of the given reaction is 4.

$\underset{x}{A} + \underset{x}{B} ⇌ \underset{2 x}{\underset{0}{C}} + \underset{2 x (at equi .)}{\underset{0 (initial)}{D}}$

$K_{c} = \frac{[C] [D]}{[A] [B]} = \frac{2 x \times 2 x}{x \times x} = 4$

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

0.2 $°$ C

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

$∆ T_{b} \propto n$

For sucrose, n = 1; $∆$ T_b = 0.1 $°$ C

For NaCl, n = 2; $∆$ T_b= 0.2 $°$ C

With which of the given pairs CO₂ resembles ?

HgCl₂, C₂H₂
HgCl₂, SnCl₄
C₂H₂, NO₂
N₂O, NO₂

HgCl₂, C₂H₂

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

CO₂- O = C = O

HgCl₂- Cl - Hg - Cl

C₂H₂- HC $\equiv$ CH

What will be the order of I^st ionisation energy?

Li > Na > K
K > Li > Na
Na > Li > K
Li > K > Na

Li > Na > K

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

Li > Na > K

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

Given, Magnetic quantum number or m = 3

$∵$ For, m = 3

l = 3 and n = 4

Which of the following have highest electron affinity?

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.

10.

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

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.