Question # 1

The mechanism of polymerization involves free radical addition polymerization or condensation polymerization. Choose the correct statement

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Polyester is an addition polymer

Polythene is an addition polymer

Polyvinyl chloride (PVC) is a condensation polymer

Polystyrene

A crystal system in which the unit cell has different all cell lengths but all angles equal to 90° it is called as

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orthorhombic

triclinic

monoclinic

cubic

Alkaline phosphatese is associated with ______ disease

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Heart disease

Rickets

Diabtese

None

Enzymes are catalysts which contain other than carbon and hydrogen one other element

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oxygen

sulphur

phosphorus

iodine

DNA is a polynucleic acid. The monomer is known as a nucleotide. What is not the component of the nuleotide

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Phosphate group

Deoxy ribose sugar

Uracil base

Adenine base

The %age of nitrogen in urea is:

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46

60

70

80

^{The common oxidation number of halogens is}

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-1

+1

-2

0

Critical temperature for a gas depends upon

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Shape of molecule

Size of molecules

Inter molecular forces

All of these

What is not true about DNA?

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it preserves genetic information

Synthesizes protein

it has a linear structure

To replicates

The pH range of the acid rain is:

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6.5 __ 6

Less than 5

8 __ 7.5

7 __ 6.5

Coordination number of Zn and ZnS (Zinc blends) is

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4

6

2

None of these

RNA is a polymer of nucleotide which consist of three components. Which one is not the component in the nucleotide of an RNA

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D-Ribose

Wracil base

Prosphate group

Thyamine base

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

The development of industries was a direct result of which major factor

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Population

Living standards

Depletion of resources

All of these

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0.02

0.2

50

25

The order of dehydration of alcohol

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10> 20> 30

10> 30> 20

20> 30> 10

30> 20> 10

0.5 M of H₂SO₄is diluted from 1 litre to 10 litre, normality of resulting solution is

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1 N

0.1 N

10 N

11 N

HNO₂acts as an/a

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Acid

Oxidizing agent

Reducing agent

All the three

Which of the following acid can be used as a catalyst in Friedal Craft's reactions

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AlCl₃

HNO₃

BeCl₂

NaCl

Raney - nickel is the alloy of Ni with

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Pt

Al

Cu

Pd

When an alcohol reacts with SOCI₂an alkyl halide is formed. What are two other products

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SO₂and HCI

SI₂and H₂O

HCI and H₂O

H₂S and HCI

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

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