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1.

For the reaction `PCl_(3) (g) + Cl_(2) (g) hArr PCl_(5) (g) ` the value of `K_(c) " at " 250^(@)C " is 26. The value of " K_(p)` at this temperature will beA. `0*61`B. `0*57`C. `0*83`D. `0*46`

Answer» Correct Answer - A::B::C::D
Discussion
2.

`N_(2)` gas id added to the reaction equilibrium `PCl_(5) (g) hArr PCl_(3) (g) + Cl_(2) (g)` at constant temperature . If pressure is kept constant, equilibrium constant will `……` and equilibrium will shift in the `……….` direction.

Answer» Correct Answer - remain constant,forward
Discussion
3.

Equilibrium constant for the reaction , `N_(2) + 3 H_(2) hArr 2 NH_(3) ` is K, then equilibrium constant for the reaction, `NH_(3) hArr 1/2 N_(2) + 3/2 H_(2) ` will be ` ……….. .`

Answer» Correct Answer - `sqrt(1//K)`
Discussion
4.

A bulb containing `N_(2)O_(4)` is colourless in ice. Its colour inboiling water is `………….` while in water at 298 K, it is ` ………… .`

Answer» Correct Answer - reddish brown, pale brown
Discussion
5.

In what manner will increase of pressure affect the following equilibrium ? `C(s) + H_(2)O (g) hArr CO(g) + H_(2) O (g)`A. Shift in the forward directionB. Shift in the reverse directionC. Increase in the yield of hydrogenD. No effect.

Answer» Correct Answer - B
Discussion
6.

Equimolar amounts of `H_(2) and I_(2)` were taken in a bulb maintained at `500 ^(@) C.` Dark violet colour faded to light violet which does not change further. This shows that the bulb contains `…………..` amounts of `…………. . `

Answer» Correct Answer - fixed, `H_(2), I_(2) and HI`
Discussion
7.

According to Law of Mass Action, the rate at which a substance reacts is proportional to its `………. . `

Answer» Correct Answer - active mass or molar concentration
Discussion
8.

For the hypothetical reactions, the equilibrium constant (K) values are given : `A hArr B , K_(1) = 2*0` `B hArr C , K_(2) = 4*0` `C hArr D , K_(3) = 3*0` The equilibrium constant (K) for the reaction `A hArr D` isA. 48B. 6C. 12D. 24

Answer» Correct Answer - A::B::C::D
Discussion
9.

In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as Assertion . For the reaction, `2NO(g0 + O_(2) (g) hArr 2 NO_(2) (g) `, increase in pressure favours the formation of `NO_(2)` Reason . The reaction is exothermic.A. If both assertion and reason are true, and reason is the true explanation of the assertion .B. If both assertion and reason are true but reason is the true explanation of the assertion .C. If assertion is true, but reason is false.D. If both assertion and reason are false .

Answer» Correct Answer - B
Discussion
10.

In terms of rate constants for forward and backward reactions `(k_(f) and k_(b))` , equilibrium constant of a reaction is equal to `…………. .`

Answer» Correct Answer - `k_(f)//k_(b)`
Discussion
11.

In which one of the following reactions, the yield of the products decreases by in creasing the pressure ?A. ` 2 SO_(2) (g) + O_(2) hArr 2 SO_(3) (g)`B. ` N_(2) (g) + 3 H_(2) (g) hArr 2 NH_(3) (g)`C. `PCl_(5) (g) hArr PCl_(3) (g) + Cl_(2) (g)`D. `N_(2) (g) + O_(2) (g) hArr 2 NO (g)`

Answer» Correct Answer - A::C
Discussion
12.

In a reversible reaction, two substances are in equilibrium . If the concentration of each one is doubed , the equilibrium constant will be.A. Reduced to half its original valueB. Reduced to one fourth of its original valueC. DoubledD. Constant

Answer» Correct Answer - D
Discussion
13.

What would happen to a reversible dissociation reaction at equilibrium when an inert gas is added while the pressure remains unchanged ?A. Less of the product will be formedB. More of the product will be formedC. More of thereactants will be fromedD. It remains unaffected.

Answer» Correct Answer - B
Discussion