Question # 1

If the volumes of reactants and products are same in a gaseous phase reaction, then the equilibrium state is not affected by

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Change of temperature

Change of pressure

Change of concentration

Catalyst

The sum of pH and pOH is

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0

7

14

10

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

The unit of Kc for the reaction N2 +O2 = 2NO will be

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mol dm-3

mol-1 dm+3

mol-2 dm+6

No units

A solution has pH zero. Its H+ ions concertation will

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zero

More than unity

Less than unity

Unity only

Which statement is correct about solubility product constant.

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It is applicable at highly soluble substances.

Value of Kap is independent of temperature

It is used for homogeneous aquarium system

It can be used to predict that precipitation will take place or not by combining two ions

When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium.

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Forward

Reverse

Neither forward nor reverse

Equally move in both direction

K_aand K_bof a conjugate acid and are related with k_was

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K_a+ K_b=K_w

K_a-K_b=K_w

K_a.K_b= K_w

K_a/ K_b= K_w

The relationship between K_pand K_cis given by

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Almost forward reaction is complete when value of Kc is

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very high

Very small

Neither large nor very small

No correlation

The pH of 10-3 mole dm-3 of an aqueous solution of H2SO4 is.

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3.0

2.7

2.0

1.5

Catalyst used in preparation of NH3 from N2 and H2 is.

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Ni

Fe

Pt

V2O5

For the equilibrium system N2 + O2 + Heat = 2NO the equilibrium constant deceases by

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Decreasing the temperature

Adding a catalyst

Adding N2

Adding NO

A solution have H+ ions concentration 1 x 10^-7 , its pH will

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Acidic

Basic

Neutral

Zero

When solid KI dissolved in water, its heat of solution is positive. What would happen to dissolution when temperature is increased.

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Increases

Decreases

Remain same

Firs increases than decreases

A buffer solution can be prepared by mixing

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Weak acid and its salt with weak base

Weak base and its salt with strong acid

Strong acid and its salts with weak base

Strong base and its salt with weak acid

The value of pH and P^oHof pure water at 25° C is

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14

7

1 x 10^-14

1 x 10¹⁴

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