Question # 1

Chief air pollutant which is likely to deplete ozone layer

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Suphure dioxide

Carbon dioxide

Nitrogen oxides and chloro flrorocarbons

The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called

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Functional isomers

Position isomers

Chain isomers

Metamers

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

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Type of Bonding

Shapes

Shape and Type of bonding

None of above

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

Ozane is not

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An allotrope

A powerful oxidizing agent

Paramegnetic

a bent molecule

The weight of 11.2 litres of CO₂at S.T.P. would be

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88 g

44 g

32 g

22 g

Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

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Helium is much less soluble in blood than nitrogen

Helium is much less soluble in blood than helium

Under the sea nitrogen and oxygen react to give poisonous nitric oxide

Nitrogen is highly soluble in water.

The mass of the neutron is of the order of

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10^-23kg

10^-24kg

10^-26kg

10^-27kg

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Each of following is true of white and red phosphours except that they

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Are both soluble in CS₂

Can be oxidized by heating in air

Consist of the same kind of atoms

Can be converted into one another

Which of the following has no tin in its composition?

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Solder

Bronze

Brass

Tin stone

When a carbon atom forms single bonds with other carbon atoms, these hybird orbitals overlap with the orbitals of hydrogen to form four bonds which are

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Three sigma and one P_i

Two sigma andtwo P_i

One sigma and three P_i

Sigma

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

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Mojarity

Molality

Mole fraction of solute

Mole fraction of solvent

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. ZnCl₂

NaCl

PCl₅

SOCl₂

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

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