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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

Vapour pressure

As the temperature rises, the kinetic energy of the molecules increases. Due to which the molecules can leave the liquid surface easily. In other words the vapour pressure increases. However, surface tension and viscosity decrease with rise in temperature. Molality is the ratio of moles of solute to weight of solvent, hence it does not depend upon the temperature.