﻿ NO2 (brown colour gas) exists in equilibrium with N2O4 (colo

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# 1.NO2 (brown colour gas) exists in equilibrium with N2O4 (colourless gas) as given by chemical equation.Mixture is slightly brown due to existence of NO2. If pressure is increased :colour intensity is increased colour intensity is decreased colour intensity first increases and then decreases No change in colour intensity

D.

No change in colour intensity

By Le-Chateliers principle, due to increase in pressure, equilibrium shifts in the direction of low pressure (in which number of mole decreases) i.e. , forward side.

2.

${\mathrm{\Delta H}}_{\mathrm{f}}^{°}$ (C2H4) , ${\mathrm{\Delta H}}_{\mathrm{f}}^{°}$ (C2H6) are x1 and x2 kcalmol-1 respectively. Then heat of hydrogenation of C2H4 is :

• x1 + x2

• x1 - x2

• -(x1 - x2)

• x1 + 2x2

3.

The heat of formation of C12H22O11 (s) , CO2 (g) and (H2O) are - 530 , -94.3 and- 68.3 kcalmol-1 respectively. The amount of C12H22O11 to supply 2700 kcal of energy is :

• 382.70 g

• 832.74 g

• 463.9 g

• 684.0 g

4.

Spontaneous adsorption of gas on solid surface is an exothermic process because :

• $\mathrm{\Delta }$H increases for system

• $\mathrm{\Delta }$S increases for gas

• $\mathrm{\Delta }$S decreases for gas

• $\mathrm{\Delta }$G increases for gas

5.

0.1 M solution of CH3COOH should be diluted to how many times so that pH is doubled ?

• 4.0 times

• 5.55 x 104 times

• 5.55 x 106 times

• 10-2 times

6.

If the equilibrium constant of the reaction of weak acid HA with strong base is 109 then pH of 0.l M NaA is :

• 5

• 9

• 7

• 8

7.

For the process ,

X (g) + e- $\to$ X- (g) ; $\mathrm{\Delta }$H = x

and X- (g) $\to$ X (g) + e-$\mathrm{\Delta }$H = y

select correct alternate

• Ionisation energy of x- (g) is y

• Electron affinity of X (g) is x

• Electron affinity of X (g) is - y

• All of the above

8.

Mass of one atom is 6.66 x 10-23 g. Its percentage in an hydride is 95.24. Thus , hydride is :

• MH

• MH2

• MH3

• MH4

9.

A 1 L flask contains 32 g O2 gas at 27C. What mass of Omust be released to reduce the pressure in the flask to 12.315 atm?

• 8 g

• 16 g

• 24 g

• 32 g

10.

1 mol of O2 and x mol of Ne in a 10 L flask at constant temperature exert a pressure of 10 atm. If partial pressure of O2 is 2 atm , moles of Ne in the mixture is :

• 1

• 2

• 4

• 3