Question # 1

How many moles of Helium gas occupy 22.4 L at 0^oC at 1 atm.Pressure?

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0.11

0.90

1.0

1.11

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCI^-

CI₂

CI^-

Which has largest first ionization energy?

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Li

Na

K

Rb

If a salt bridge is removed between the two half cells the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

Ethyl chloride on treatment with aqueous alkali gives

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Ethane

Ethene

Ethanal

Ethanol

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

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Molarity

Molality

Mole fraction of solute

Mole fraction of solvent

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde

In cold countries ethylene glycol is added to water in radiators of cars during winter It result in

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Lowering in b.pt.

Reducing viscosity

Reducing specific heat

Lowering in freezing pt.

A clathrate may be defined as a

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Cage compound

Liquid crystal

Mixture

Solid solution

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

Which of the substances Na, Hg, S Pt and graphic can be used as electrodes in electrolytic cells having aqueous solution?

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Na,Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

Mild oxidation of glycerol with H₂O₂/FeSO_{4 gives}

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Glyceraldehyde

Dihydroxy acetone

Glycerose

None

The reaction/method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide.

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

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1-Propanol

2-Propanol

2-Methyl2-Proponal

Ethanol.

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

Wholer prepared urea from

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Ammonia

NH₄CNO

NH₃

Uric acid

Which one is not a pollutant normally?

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Hydrocarbons

Carbon dioxide

Carbon monoxide

Sulphur dioxide

Propyne on hydrolysis is presence of H₂SO₄and HgSO_{4 gives}

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Acetaldehyde

Acetone

Formaldehyde

None

Sodium thisoulphate is used in photography because of its

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Oxidizing behaviour

Reducing behaviour

Complexing behaviour

Photochemical behavior

Which of the following is different from the other three oxides?

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MgO

SnO

ZnO

Cr₂O₃

Aluminothermy used for on the spot welding of large iron structure is based upon the fact that

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Refraction between aluminium and oxygen is endothermic

Reaction between iron and oxygen is endothermic.

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