Question # 1

The crystal of diamond is

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ionic

molecular

covalent

metallic

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

Correct order for the reactivity ofalkyl halide in S, reactions

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R-I>R-F>R-CI

R-F>R-CI>R-I

R-I>R-CI>R-F

R-CI>R-I>R-F

In addition to many pollutants present in ground water, a successful study was conducted to remove a highly Toxic chemical.What chemical is this

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Cobalt

Nickel

Arsenic

Sulphur

Substance which is formed as well as consumed during a chemical reaction and have temporary existence.

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Reactant

product

Catalyst

Intermediate

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

There are 20 amino acids found in protein which is not the property of these amino acids

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They are all alpha-amino acids

They are all optically active

They have high decomposition point

They are water soluble

Natural water is

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Pure

Impure

Acts as solute

Distilled

The rigid rocky part of earth crust called lithosphere extends upto a depth of:

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10 km

100 km

1000 km

1500 km

Cotton has cellulose in it:

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96%

97%

98%

99%

Oxidation reduction is done by

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Oxidoreductase

Lipases

Lyase

None of these

The electropositive elements from

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Acidic oxides

Basic oxides

Neutral oxides

None

The main source of natural fibre is

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Animal fibres

Vegetables fibres

Mineral fibres

All of the above

Which formula represents the organic compound formed by the reaction of propanoic acid with methanol in the presence of concentrated sulphuric acid as a catalyst

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CH₃CH₂COCH₃

CH₃CH₂CO₂CH₃

CH₃CO₂CH₂CH₃

CH₃CH₂CH₂CO₂CH₃

Which of the following molecules has zero dipole moment>

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NH₃

CHCl₃

H₂O

BF₃

Bronze is an alloy of Cu and

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Zn

As

Sb

Sn

Corrosion reaction are

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Spontaneous redox reaction

Non-spontaneous acid-base reactions

Spontaneous acid-base reactions

None of these

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

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2-Ethoxypentane

Pent-1-ene

cis-Pent-2-ene

trans-Pent-2-ene

In which molecule carbon atom is sp²hybridized

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CH₄

C₂H₄

C₂H₂

None of the above

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymers

Vital force theory was rejected by

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Berzellius

Kolbe

Wholer

Lavoiser

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