Question # 1

Which of the following mineral does not contain Al?

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Cryolite

Mica

Feldspar

Fluorspar

Al is more reactive than Fe but Al is less easily corroded than Fe because

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It is a noble metal

oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

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

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Be

Mg

Sr

Calcium

Enzymes are

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Proteins

Minerals

Oils

Fatty acids

Detergents are

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Synthetic products

Natural products

Both A and B

None of the above

Which has largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

Potassium is kept in

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Water

Ammonia

Alcohol

Kerosene.

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

The last orbit of argon would have electrons

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8

18

2

6

SO₂ and NO₂produce pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

Which of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

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Mercury

Lead

Nitrogen oxide

Sulphur oxide

Which one of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

Which of the following statement regarding catalyst is not true?

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A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst can initiate a reaction

A catalyst dose not alter the equilibrium in a reversible reaction

Catalysts are sometimes very specific in respect of reaction.

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