Question # 1

Setting of cement is an

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Exothermic reaction

Endothermic reaction

Neither exothermic nor endothermic

None

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

Reaction of ethylamine with chloroform in alcoholic KOH producers

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

Octane number can be changed by

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Isomerisation

Alkylation

Cyclisation

All of these

The substance used as a smoke screen in warfare is

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SiCI₄

PH₃

PCI₅

Acetylene

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

Among the alkaline earth metals the element forming predominantly covalent compounds is

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Be

Mg

Sr

Calcium

When electrons revolve is stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

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