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JEE Chemistry Solved Question Paper 2009

Multiple Choice Questions

11.

What is the total number of moles of H₂SO₄ needed to prepare 5.0 L at a 2.0M solution of H₂SO₄ ?

12.

Which combination of atoms can form a polar covalent bond ?

H and N
H and Br
N and N
Na and Br

13.

How many joules of heat are absorbed when 70.0 g of water is completely vaporised at its boiling point ?

23, 352
7,000
15,813
158, 130

14.

In any chemical reaction, a quantity that decrease to a minimum is

free energy
entropy
temperature
enthalpy

15.

The pH of 10^-8 M NaOH aqueous solution at 25°C, is

7.02
7.0
6.89
6.0

16.

Decrease in atomic number is not observed during

β- emission
α- emission
positron emission
electron capture

17.

The buffering action of an acidic buffer is maximum when its pH is equal to

5
7
1
pK_a

18.

Which of the following will increase with the increase in temperature ?

Surface tension
Viscosity
Molality
Vapour pressure

19.

Geometry of methyl free radical is

pyramidal
planar
tetrahedral
linear

20.
The electron configuration of the oxide ion is much most similar to the electron configuration of the

sulphide ion

nitride ion

oxygen atom

nitrogen atom

nitride ion

Species having the same number of electrons as in oxide ion, has the same electronic configuration as oxide ion.
In oxide ion (O^2-), number of electrons
= 8+2 =10
In sulphide ion (S^2-), number of electrons
= 16+2 =18
In nitride ion (N^3-), number of electrons
= 7+3 =10

In oxygen atom and nitrogen atom, number of electrons = 8, 7 respectively.
Hence, electronic configuration of

$O^{2 -} or N^{3 -} (10) = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, π 2 p_{x}^{1}, \approx π 2 p_{y}^{1}$