Question # 1

The law of mass action was given by

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D.C. down and P wage

Gay Lussic and C.M

C.M Goldberg and P. Waage

Hendeson and Le Chateller's

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dm⁺⁶mole^-2

mole²dm^-6

Mole dm^-3

Having no units

For which system does the equilibrium constant K_chas units of (concentration)^-1

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

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zero

More than unity

Less than unity

Unity only

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 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

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 sum of pH and pOH is

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0

7

14

10

Kw for water at 0 oc is 0.1 x 10^-34 and at 100 ^oC 7.5 x 10^-14, How many times dissociation of water increase from 0 ^oCto 100 ^oC

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7.5 times

50 times

75 times

100 times

A solution will be unsaturated if

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Ionic product = Kap

Ionic product < Ksp

Ionic Product > Ksp

both 'a' and 'b' are correct

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

pKa of CH3COOH is 4.74. The pKb value of CH3COO- ions will be

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7

14

9.26

zero

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

When small amount of acid or base is added to buffer, its pH.

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Remain same

Always increases

Always decreases

slightly increases or decreases

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

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Ni

Fe

Pt

V2O5

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

The pK_avalue of CH₃COOH is 4.74 when we mix CH₃COOH and CH₃COONa in the ratio of 10:1, tehn the pH of the buffer is

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4.74

5.74

3.74

7.00

The number of moles of acid or base required by one dm³of buffer to alter its pH by one unit is called

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Buffer efficiency

Buffer capacity

Buffer action

None

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