Question # 1

Repeated extraction using small portions of solvent are more.

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Accurate

efficient

Slow

Rapid

The nature of bond in diamond is

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Electrovalent

Metallic

Coordinate covalent

Covalent

Which of the following will have highest rate of diffusion

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O2

CO2

NH3

SO2

NH₃shows a maximum boiling point among the hydrides of V-A group elements due to

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Very small size of nitrogen

Lone pair electrons present on Nitrogen

Enhanced electronegative character of Nitrogen

Pyramidla structure of NH₃

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

Depression of freezing point method is used for determination of molar masses of

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Electrolytes

Non-volatile solids

Volatile solids

Volatile liquids

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

The number of bonds in nitrogen molecules is.

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One pi and one sigma

One pi and two sigma

Thre sigma only

Two pi and one sigma

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

Which of the following has linear structure.

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CO2

NH3

CH4

H2O

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

The substance which decrease the activity of a catalyst is called.

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Promoter

Activator

Inhibitor

Positive catalyst

Azeotropic mixture

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Obey Raoult's law

Do not obey Raoult's law

Boils at low temperature only

Boils at high temperature only

Anode rays were discovered by

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J. Stoney

Rutherford

J.J. Thomson

Goldstein

Which one of the following substances is not amorphous

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Polymer

Rubber

Glass

AgNO₃

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideal behaviour of gases

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At high pressure, the gas molecules move in one direction only

At high pressure, the collisions between the gas molecules are increased

At high pressure, the volume of the gas becomes insignificant

At high pressure, the intermolecular attraction becomes significant

Colligative properites are the properties of

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Dilute solutions which behave as nearly ideal solution

Concentrated solution which behave as nearly non-ideal solution

Both a and b

Neither a nor b

Which of the hydrogen halides has the highest percentage of ionic character

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HF

HBr

HCI

HI

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