With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.

Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.

A

Increases

B

Remains unchanged

C

Decreases

D

Unpredictable from the data

In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?

A

$$2{{\text{O}}_3} \rightleftharpoons 3{{\text{O}}_2}$$

B

$${{\text{N}}_2} + {{\text{O}}_2} \rightleftharpoons 2{\text{NO}}$$

C

$$2{\text{N}}{{\text{O}}_2} \rightleftharpoons {{\text{N}}_2}{{\text{O}}_4}$$

D

$$2{\text{S}}{{\text{O}}_2} + {{\text{O}}_2} \rightleftharpoons 2{\text{S}}{{\text{O}}_3}$$

In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?

A

N₂ + O₂ ⇋ 2NO

B

PCl₃ + Cl₂ ⇋ PCl₅

C

N + 3H₂ ⇋ 2NH₃

D

2SO₂ + O₂ ⇋ 2SO₃

In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants )

A

Addition of inert gas favours the forward reaction, when Δx is positive

B

Pressure has no effect on equilibrium, when Δn = 0

C

Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero)

D

All of the above

The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to

A

d

B

$$\sqrt {\text{d}} $$

C

d^1.5

D

d²

With increase in initial concentration, the fractional conversion of a first order reaction in a given time

A

Increases

B

Decreases

C

Remains constant

D

Unpredictable

For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.

A

Film diffusion

B

Diffusion through ash layer

C

Chemical reaction

D

Either A, B or C

For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

A

Film diffusion

B

Diffusion through ash layer

C

Chemical reaction

D

Either A, B or C

In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous

A

Uranium oxide

B

Uranium hexaflouride

C

Uranium carbide

D

Uranium sulphate

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

A

400-500

B

900-1000

C

1400-1500

D

1700-1800

With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.

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