﻿ At identical temperature and pessure, the ratio of diffusion of h

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# 1.At identical temperature and pessure, the ratio of diffusion of hydrogen gas is $\sqrt[3]{3}$ times that of a hydrocarbon having molecular formula CnH2n-2. What is the value of 'n'?1 4 3 8

B.

4

Hence, 12n + (2n - 2) × 1 = 54

14n = 56

n = 4

Thus, hydrocarbon is C4H6.

2.

Dipole moment of  is 1.5 D. The dipole moment of  is

• 1.5 D

• 2.25 D

• 1 D

• 3 D

3.

Which of the following thermodynamic relation is correct ?

• dG = Vdp- SdT

• dE = pdV + TdS

• dH = -Vdp + Tds

• dG = Vdp + SdT

4.

Calculate Kc for the reversible process given below if Kp = 167 and T = 800°C

CaCO3 (s) $⇌$ CaO (s) + CO2 (g)

• 1.95

• 1.85

• 1.89

• 1.60

5.

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?

• The backward reaction has higher activation energy than the forward reaction.

• The backward and the forward processes have the same activation energy.

• The backward reaction has lower activation energy

• No activation energy is required at all since energy is liberated in the process.

6.

In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is

• a perfect ellipse

• a closed ellipse-like curve, narrower at the perihelion position and flatter at the aphelion position

• a closed loop on spherical surface

• a rosette

7.

In the reaction of sodium thiosulphate with I2 in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

• molar mass of sodium thiosulphate

• the average of molar masses of Na2S2O3 and I2

• half the molar mass of sodium thiosulphate

• molar mass of sodium thiosulphate × 2

8.

0.1M HCl and 0.1M H2SO4 each of volume 2 mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01N NaCl solution. The pH of the resulting mixture is

• 1.17

• 1.0

• 0.3

• log 2 - log 3

9.

The molarity of a NaOH solution by dissolving 4 g of it in 250 mL water is

• 0.4 M

• 0.8 M

• 0.2 M

• 0.1 M

10.

If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge.

• S1-

• Si2-

• P3-

• S2-