Question # 1

Dilatometer method is useful for the reactions that involve.

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Ionic species

Where reactant absorb U.V. visible or infrared radiations

Small volume changes in solutions

Change in refractive indices

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1

2

3

None of these

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

Which particle has a mass 1/1836 time, that of hydrogen.

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Proton

Positron

Electron

Neutron

In a period of periodic table, atomic radii

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Increases

Decreases

Remain same

First decreases than increases

The shape of Sncl2 molecule is.

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Linear

Angular

Trigonal planar

Tetrahedral

Amorphous solids.

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Have sharp melting points.

Undergo clean cleavage when cut with knife

Have perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms.

The deviation of a gas from ideal behaviour is maximum at.

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-10 ^oC and 5.0 atm

-10 ^oC and 2.0 atm

100 ^oC and 2.0 atm

0 ^oC and 2.0 atm

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

18 g glucose is dissolved in 90 g o water, The relative lowering of vapour pressure is equal to.

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1/5

5.1

1/51

6

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

Which is not a molecular ion.

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He+

CH3+

NH3-

CO+

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

Which of the following contains the same number of molecules as 9 g of water.

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2 g of hydrogen gas

14 g of nitrogen gas

32 g of oxygen gas

44 g of carbon dioxide gas

The real gas obeying Van der Waal's equation will resemble ideal gas is.

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both 'a' and 'b' are large

both 'a' and 'b' and small

'a' is small and 'b' is large

'a' is large and 'b' is small

The rate of reaction

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Increases as the reaction proceeds

Decreases as the reaction proceeds

Remains the same as the reaction proceeds

May decrease or increase as the reaction proceeds

The temperature of natural plasma is about.

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200000 ^oC

10000^oC

5000^oC

1000^oC

Which of the following value of heat of formation indicates that the product is least stable.

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-94 KJ

-231.6 KJ

+21.4 KJ

+70 KJ

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