Question # 1

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

the order of the rate of diffusion of gases NH₃, SO₂, CI₂and CO₂is

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NH₃> SO₂>CI₂CO₂

NH₃> CO₂> SO₂> CI₂

CI₂> SO₂> CO₂> NH₃

NH₃> CO₂> CI₂> SO₂

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

If absolute temperature of gas is doubled and the pressure is reduced to one half, the volume of the gas will.

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Remain unchanged

Increase four times

Reduce to 1/4

Be doubled

The mass of one mole of electrons is

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

pH of buffer is calculated by.

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Sorenson equation

Mosley equation

Henderson equation

De broglie equation

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

During the process of crystallization, the hot saturated solution;

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Is cooled very slowly to get large-sized crystals

Is cooled at a moderated rate to get medium-sized crystals

Is evaporated to get the crystals of the product

Is mixed with an immiscible liquid to get the pure crystals of the produce

The volume occupied by 1.4 g on N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

The rate of reaction

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Increases

Decreases

Remains the same

May decrease of increase

The molal boiling point constant is the the ratio of the elevation in boiling point to.

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

Fuel cells are the means by which chemical energy may be converted into

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Heat energy

Magnetic energy

Sound energy

Electric energy

The boiling point of water at Murree Hills.

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90^oC

98^oC

100^oC

120^oC

Electrode of the lead storage battery are immersed in dilute H2SO4 which has strength by mass

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100%

98%

30%

10%

For a gas obeying Boyle's law if pressure is doubled, the volume becomes.

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Double

One half

Four times

Remains constant

Dipole-dipole forces are present among.

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Molecules of Iodine

Atoms of Neon i gaseous state

Chloroforms' molecules

CCl4 molecules

Which of the following is a polar molecule

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CCl4

HCl

BF3

CO2

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