Question # 1

Which metal is protected by a layer of its own oxide?

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Al

Ag

Au

Fe

Potassium is kept in

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Water

Ammonia

Alcohol

Kerosene.

When KClO₃is heated, it decomposes into KCl and O_{2. If some MnO2 is added, the reaction goes much faster because}

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MnO₂decomposes to give O₂

MnO₂provide heat by reacting

Better contact is provided by MnO₂

MnO₂acts as a catalyst.

Saturated solution of NaCl on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

Which of the substances Na, Hg, S, Pt and graphite 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

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

Which inorganic precipitate acts as semipermeabale membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

Ammonia gas used directly as a fertilizer is injected into the soil at a depth of about

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Two inches

Three inches

Five inches

Six inches

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

A clathrate may be defined as a

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Cage compound

Liquid crystal

Mixture

Solid solution

Which is not a a colligative property?

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Osmotic pressure

Lowering of vapour pressure

Depression of freezing point

Elevation of boiling point

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

a bleaching agent

A dehydration agent.

Hybridization explain the ----------- of orbitals

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Type of Bonding

Shapes

Shape and Type of bonding

None of above

Vital force theory was rejected by

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Berzelius

Kolbe

Wholer

Lavoiser

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

Which one of the following has the lowest boiling point?

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B

Al

Ga

Ti

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