Question # 1

If the solvent is inflammable for heating purpose we use

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Ice bath

Water bath

Wire gauze

Thermostat

Which of the following does not reflect the periodicity of elements?

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Bonding begaviour

Electronegativity

Ionisation potential

Neutron/proton ratio

In which of the following elements +1 oxidation state is more stable than +3

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B

Al

ga

Ti

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 reaction.

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Which quantum number is sufficient to describe the electron is hydrogen

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ι

n

m

s

If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately

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800mL

200mL

10mL

Zero

In the manufacture of iron from haematite, limestone is added to act as.

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Flux

A reducing agent

Slag

An oxidizing agent

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

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1-Propanol

2-Propanol

2-Methyl2-Proponal

Ethanol.

Calcium cyanamide on treatment with steam under pressure gives NH₃and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fuorine

The bond angle H-O-H in ice is closest to

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120° . 28'

60°

90°

109°

Aluminothermy used for on the spot welding of large iron structure is based upon the fact that

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Refraction between aluminium and oxygen is endothermic

Reaction between iron and oxygen is endothermic.

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

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

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