Question # 1

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

Water which his considered to be safe for human consumption is known as

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distilled water

contaminated water

potable water

rain water

The temperature in the incineration of industrial and hazardons waster process had a range:

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

Which of the following are characteristics of oxidizing smog?

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It is yellow brownish grey haze

It has unpleasant odour

Its main reactant are nitric oxide & unburnt hydrocarbon

All of the above

Which of the following has positive value of enthalpy

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Neutralisation

Atomization

combustion

All of the above

The reaction C2H5CI + aqueous KOH---------C2H5OH+ KCI is

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Electrophilic addition

Nucleophilic addition

Electrophilic substitution

Nucleophilic substitution

A polymer of polyvinyl chloride with DP 1000 has molecular or molar mass:

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630

6300

63000

630000

The fibre which is made from vinylidine chloride polymer is called

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rayon fibre

azlon fibre

acetate fibre

all of the above

Carbon-Carbon double bond length in C3H6

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154 pm

134 pm

120 pm

105 pm

An element that is not an essential par of proteins is

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O

N

H

S

Alkanes may be prepared by the reaction of alkyl halides with

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Alcohol

Carboxylic acid

Grignard reagents

None of these

A sequence of how many nucleotides in massenger RNA makes a codon for an amino acid

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Three

Four

One

Two

An electrophile may be

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Positive

Negative

Neutral

Both c and a

In lead accumulator the electrolyte is H₂SO₄solution is

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30% H₂SO₄

60% H₂SO₄

80% H₂SO₄

90% H₂SO₄

Setting time of cement is controlled by adding:

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Epsom

Gypsom

CaCO₃

CaCl₂

Which of the following pair contains isomers of each other

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Propanoic acid and propanone

Acetone and acetaldehyde

Ethyl alcohol and diethyl ether

Methyl alcohol and dimethyl ether

The reagent which forms crystalline osazone derivative when treated with glucose is

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Fehling solution

Phenyl hydrazine

Benedict solution

Hydroxyl amine

The sample being analyzed is called :

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Electrolyte.

Substance.

Analyte.

All of above.

The self linking property of carbon is called as

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Linking polymerization

Addition

Catenation

Elimination

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

General formula of alcohol is:

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ROH

Ar-OH

R-O-R

Ph-OH

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