In an isochoric process, the increase in internal energy is equal to:

• the sum of heat absorbed and work done

• the work done

• heat absorbed

• heat evolved

75 c.c. of N/5 H₂SO₄, 10 c.c. of N/2 HCl and 30 c.c. of N/10 HNO₃ are mixed together. The strength of the resulting acid mixture is:

• 0.1N

• 0.2N

• 0.3N

• 0.4N

Among the following compounds which is planar in shape is

• acetylene

• benzene

• isobutene

• methane

Which will have maximum ionization energy?

• Na

• Mg

• K

• Bi

Heat of a reaction at constant pressure is equal to:

• H_P - H_R

• H_P + H_R

• H_P $\times$ H_R

• $\frac{{\mathrm{H}}_{\mathrm{P}}}{{\mathrm{H}}_{\mathrm{R}}}$

One gram of mass is equal to :

• 9 x 10²⁰ ergs

• 7 x 10¹⁵ ergs

• 5 x 10¹⁰ ergs

• 3 x 10⁵ ergs

Vapour density of a volatile substance is 4 (CH₄ = 1). Its molecular weight would be:

• 2

• 8

• 64

• 128

Which of the following ions is paramagnetic?

• Cu⁺⁺

• Zn⁺⁺

• Ni⁺⁺

• Both 'a' and 'c'

9.

The pH of blood is :

• greater than 10

• less than 6

• greater than 7 and less than 8

• greater than 8 and less than 9

If K_b of HCN is 4.0 $\times$ 10^-10, then the pH of 2.5 $\times$ 10^-1 molar aqueous HCN is

• 2.0

• 4.7

• 5.0

• 2 x 10^-5