Question # 1

When one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide.

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Diamond

C2H6

Methane

CO2

A molecule has two ions pairs and two bond pairs around the central atom. The shape of molecule is.

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Linear

Pyramidal

Angular

Tetrahedral

In order to mention the B.P. of water at 110°C, the external pressure should be

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

760 torr

Any value of pressure

Which properties of liquid is measured by polarimeter

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Conductance

Refractive index

Optical activity

Change in volume

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

Which statement is incorrect about Dempster's mass spectrometer.

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Solid sample can be used in this mass spectrometer

Ions are detected on the basis of mass to charge ratio

Atoms or molecules are ionized with beam of electron.

This spectrometer work at one atmospheric pressure.

Many element have fractional atomic masses. This is because.

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the mass of the atom is itself fractional

Atomic masses are average mases of Isobars

Atomic masses are average masses Isotopes

Atomic masses are average masses of Isotopes proportional to their relative abundance.

NH3 shows a maximum boiling point among the hydrides of the group V elements due to.

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Very small size of nitrogen

Long pair of electrons present on nitrogen

Enhanced electronegative character of nitrogen

Pyramidal structure of NH3

Normal temperature and pressure (S.T.P) of gas rafers to

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273 K and 76 mm Hg

273° C and 760 mm Hg

273 K and 760 mm Hg

273° C and 76 mm Hg

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

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HF

HBr

HCl

HI

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

How many balloon of 0.25 dm3 capacity at 1 atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm3 capacity at 10 atmospheric pressure.

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50

90

180

200

In azeotropic mixture showing positive deviation from Raoult's law, the volume of the mixture is.

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slightly more than the total volume of the components

Slightly less than the total volume of the component

Equal to the total volume of the components

None of these

The volume of a gas at 0 oC is 273 dm3, the pressure remaining constant. At which temperature its volume will be doubled.

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273 K

273 ^oC

546 ^oC

316 K

Upper consulate temperature for water phenol system is.

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150 ^oC

65.9 ^oC

120 ^oC

130 ^oC

Which acid has less value of pKa.

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CH3COOH

H2S

H2CO3

HCl

Which particle have greater wave nature.

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Electron

Proton

Neutron

a particles

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