Question # 1

The enthalpy of combustion is

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Positive

Negative

Either positive or negative

No correlation

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

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1

2

3

None of these

Which of the following molecules have highest bond energy

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F2

Cl2

Br2

I2

Polymorphic substances have

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Same physical and chemical properties

Different physical and chemical properties.

Same physical but different chemical properties

Different physical and same chemical properties.

All radio active disintegration nuclear reaction are of.

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First order

Zero order

2nd order

Third order

An orbital which is spherical and symmetrical is

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S-Orbital

P - Orbital

d- Orbital

f - Orbital

The molar volume of CO2 is maximum at.

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STP

127 ^oC and 1 atm

0 ^oC and 2 atm

273 ^oC and 2 atm

In chromatographic technique. Rf has unit.

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Mol dm-3

Cm

m3

No units

The molar volume of CO₂is maximum at

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STP (0°C and 1 atm)

127° C and 1 atm

0°C and 2 atm

273°C and 2 atm

The unit of rate constant is same as that of rate of reaction in

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first order reaction

Second order reaction

Third order reaction

Zero order reaction

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

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C2H6

C2H4

C2H2

C6H6

The Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

The substance used for decolorization of crystalline substance is

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G2O5

Chloroform

Animal charcoal

Soda ash

When solid KI dissolved in water, its heat of solution is positive. What would happen to dissolution when temperature is increased.

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Increases

Decreases

Remain same

Firs increases than decreases

The spreading of fragrance of a rose or scent in air is due to.

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Effusion

Diffusion

Osmosis

Evaporation

Which one of the following has the same number of electrons as an alpha particle.

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H

He

H+

Li+

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