11.

The mass of 1 mole of electron is

• 9.1 × 10^-28 g

• 1.008 mg

• 0.55 mg

• 9.1 × 10^-27 g

The bond order of N is

• 1.5

• 3.0

• 2.5

• 2.0

The heats of combustion of carbon monoxide at constant pressure and at constant volume at 27°C will differ from one another by :

• 27 cal

• 54 cal

• 300 cal

• 600 cal

For the reaction

A(g) + 2B(g) → 2C (g) + 3D (g)

the change of enthalpy at 27° is 19 kcal. The value of ΔE is:

• 21.2 kcal

• 17.8 kcal

• 18.4 kcal

• 20.6 kcal

Calculate the total pressure in a 10.0 L cylinder which contains 0.4 g helium, 1.6 g oxygen and 1.4 g nitrogen at 27°C.

• 0.492 atm

• 49.2 atm

• 4.92 atm

• 0.0492 atm

If the energy difference between the ground state of an atom and its excited state is 4.4× 10^-4J, the wavelength of photon required to produce the transition :

• 2.26 × 10^-12m

• 1.13 × 10^-12m

• 4.52× 10^-16m

• 4.52 × 10^-12m

Diagonal relationship is for :

• Li - Na

• Be - Mg

• Si - Cl

• B - Si

The value of the ionic product of water depends:

• on volume of water

• on temperature

• changes by adding acid or alkali

• always remain constant

The radiant energy from the sun is due to :

• combustion

• nuclear fusion

• nuclear fission

• chemical reaction

Heavy water is:

• water containing Fe, Cr, Mn

• water at 0°C

• D₂O

• water obtained after distillation