Question # 1

The main pollutant of leather tanneries in the waste water is due to

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Lead

Chromium VI

Copper

Chromium III

For ----------------- Mechanism, the first step involved is the same

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E1 and E2

E2 and S_N2

S_N1 and S_N2

E1 and S_N1

S_N2 reactions can be carried out with

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Primary alkylhalide

Secondary alkyhalide

Tertiary alkylhalide

All of these

Which chemicals used for detection of amino acids.

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NaOH + I2

Phenyl hydrazine

Ninhydrin

Benedict's solution

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

In which block of periodic table non metals are present.

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s

p

d

f

The degree of unsaturation of fat is measured by

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Iodine number

Oxidation number

Reduction number

Saponification value

Which one of the following does not react with dilute sulphuric acid.

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Mg (OH)2

Mg

MgO

Mg(NO3)2

Woody raw material for paper pulp is obtained from

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Cotton

Bagasse

Poplar

Rice straw

Bone ash contain calcium phosphate

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40%

50%

70%

80%

Which of the following is a typical transition metal.

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Sc

Y

Ra

CO

Boiling point range of petroleum ether.

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5- 20 ^oC

10- 30^oC

20- 60^oC

30- 90^oC

Which substance is used for silvering of mirror.

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Acetaldehyde

Ethanol

Ethylene glycol

Acetone

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms

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Two

Three

One

Four

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

Which of the following will have the highest boiling point.

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Methanal

Ethanal

Propanal

2-Hexanone

Chlorine heptoxide reacts with water to form

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

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