Question # 1

Which is the chemical formula of calcium super phosphate:

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CaH₂PO₄

CaHPO₄

Ca(H₂PO₄)₂

none of above

Optimum temperature for enzyme activity is

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125°C

37°C

40°C

100°C

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Fungicides are the pesticides which:

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Kill plants

Kill insects

Kill herbs

Control the growth of fungus

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymer

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

An amion acid exists in the form of Zwitter-ioin which has:

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one + ve charge

one - ve charge

one +ve and -ve charge

two +ve charge

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

The other name for cross linked polymers is

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Linear polymer

Branched polymers

Inter connected polymers

None of these

Amongst the following the compound that can be most readily sulphonated is

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Toluene

Benzene

Nitrobenzene

Chlorobenzene

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Factors affecting denaturation of proteins:

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Change in temp and pH

Strong reducing agent

Strong oxidizing agent

All of these

Which is independent of temperature

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Molarity

Molality

Normality

Mole fraction

Solutions with same osmotic pressures are called

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Hypertonic

Hypotonic

Isotonic

Normal

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called:

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Fibre

Plastic

Vanish

Polyamide resin

Oxidation reduction is done by

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Oxidoreductase

Lipases

Lyase

None of these

The metal present in blood is

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Al

Hg

Cu

Fe

Ethanol can be converted into ethanoic acid by

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Hydrogenation

Hydration

Oxidation

Fermentation

Lead accumulator contains

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30% NaCI solution as electrolyte

30% HCI solution as electrolyte

30% H₂SO₄solution as electrolyte

30% NaOH solution as electrolyte

Oxidation of ter-alcohol gives:

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Aldehyde

Formaldehyde

Ketone

Alkens

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