Question # 1

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

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

Evaporation of water is

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An exothermic change

An endothermic change

A process where no heat changes occur

A process accompanied by chemical

Wholer prepared ures from

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Ammonia

NH₄CNO

NH₃

uric acid

An exothermic reaction is one in which the reacting substances

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Have more energy than the products

Have less energy than the products

Have the same energy as the products

Are at a higher temperature than the products

Acetic anhydride is obtained form acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

The substance used as a smoke screen in warfare is

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SiCI₄

PH₃

PCI₅

Acetylene

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

Which one is not usually used for the crystallization

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Acetone

Acetic acid

Sulphuric acid

Chloroform

Which is the most amphoteric?

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Na₂O

MgO

AI₂O₃

CaO

The mass of the neutron is of the order of

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10^-23 kg

10^-24 kg

10^-26 kg

10^-27 kg

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