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MDCAT Chemistry Chapter 20 Macromolecules Online Test MCQs With Answers

Question # 1

If the temperature is inereased of following reaction, then will go in N2 +3H2 <---------> .2NH3, ∆H= -Ve

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Forward direction

Reverse direction

Remain constant

Cannot be predicted

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Question # 2

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

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Question # 3

The units of ionic product of H2O is

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Mole dm-3

Mole2 dm-6

Mole-1 dm-3

Mole-2 dm-6

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Question # 4

The solubility product is only applicable for those substance whose molar concentrations is

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0.01

Equal to 1

Less than 0.01

Greater than 10

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Question # 5

lonization of KCIO3. is suppressed by

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Increasing temperatuse

adding KCl

adding NaNO3

Decreasing temperature

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Question # 6

The pH of neutral water is 6.8 then the temperature of H2O is

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25°C

More than 25°C

less than 25 C°

Not predicted

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Question # 7

What will be the pH of 1.0 mol dm -3 of H2X, which is only 50% dissociated

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Less than 0

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Question # 8

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

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Question # 9

Which of the following is a base according to lowery Bronsted concept?

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I-1

HCl

H3O+

NH4+1

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Question # 10

The value of Kc for H2O at 25C° is

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1x10 (-14)mole dm-3

14 mol dm-3

1.86×10(-16) mol dm-3

1.0x10 (-7)moldm-3

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Question # 11

What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated

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2.7

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Question # 12

With increase in temperature, ionic product of H2O

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Decreases

Remains same

Increases

May increase or decrease

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