Question # 1

Molecule in which the distance between two carbon atoms in the largest is.

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C2H6

C2H4

C2H2

C6H6

In mass spectrometry, ions are separated on the basis of.

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Masses only

Charge only

Change to mass ratio

Mass to charge ratio

Tin has Isotopes

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7

9

11

5

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

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0 ^oC

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546 ^oC

200 ^oC

546 K

273 K

The mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

For a given process, the heat chagnes of constant pressure and at constant volume are related to each other as.

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qp= qv

qp<qv

qp>qv

None of these

Anode rays were discovered by

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J. Stoney

Rutherford

J.J. Thomson

Goldstein

Chlorine atom and chloride ions.

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Are chemically identical

Are allotropes of chlroin

Have same number of electrons

Have same number of protons

Which of the following species has unpaired electrons in anti bonding molecular orbitals

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O2

N2

B2

F2

When water freezes, its volume increase.

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12%

9%

15%

18%

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air

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Remains constant

Increase

Decrease

Increase a bit

I molar volume of a gas at S.T.P is occupied by

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1 g of gas

6 x 10²³g of gas

22.4 m³of gas

1 gram molecular mass of gas

Percentage ionic character of HF is.

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100%

80%

43%

57%

On which factor boiling point of a liquid depends.

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Amount of the liquid

Shape of the container of the liquid

Type of burner used for boiling

External pressure

The paramagnetic behaviour of oxygen is well explaned on the basis of.

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M.O Theory

N.B Theory

VSEPR Theory

CF theory

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

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Chlorine

Argon

Phosphorus

Silicon

Which statement about a molecule is incorrect.

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It exist independently

Molecules of a substances are similar

Hemoglobin is a homoatomic molecules

Oxygen molecule is a macromolecule

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