Question # 1

Formic acid is obtained when

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Calcium acetate is heated with conc. H₂SO₄

Calcium formate is heated with calcium acetate

Glycerol is heated with oxalic acid

Acetaldehyde is oxidized with K2Cr₂O₇ and H₂SO₄

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

Crystal can be classified in to -------------- basic crystal habits

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7

3

14

3

The chemical composition of white lead is

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Na₂CO₃

Pb₃O₄

Pb(OH)₂.2PbCO₃

PbO

The percentage of nitrogen in urea is

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46

60

70

80

Vitamin A is present in

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Liver

Milk

Green vegetables

All

Bell metal is an alloy of

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Cu, Zn and Sn

Cu, Zn and Ni

Cu and Zn

Cu and Sn

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

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

The number of unpaired electrons in the p-subshell of oxygen atom

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1

2

3

4

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

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HCl + anhyd. ZnCl₂

NaCl

PCl₅

SOCl₂

During the folding of filter paper the apex form angle of about

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80°

60°

180°

90°

Which of the following process is used to separate insoluble particles from liquids?

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Seperation

Filtration

Crystallization

Condensation

Galena is an ore of

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Gallium

Lead

Tin

Germanium

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

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Lowering in b.pt.

Reducing viscity

Reducing specific heat

Lowering in freezing pt.

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