Question # 1

The enzymes that catalyse the addition or removal of ammonia are:

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Lyases

Ligases

Transferases

Kinses

In graphite crystal, carbon is

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sp hybridized

sp²hybridized

sp³hybridized

None

Fourth structure of protein structure refers to

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Proteins formed of more than one monomer

Myoglobin is an example

Depends on covalent bonds

None of these

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Total number of possible chain and positional isomers of butyl alcohol among alcohols are

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Four

Five

Two

Six

The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

An element from the given below exists as discrete small molecules in the solid state. Which is that?

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Sodium

Silicon

lodine

lron

Which is used as a coagulant:

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Ferric salts

Potash alum

a and b both

Chlorine

The ratio of diffusion of equal volume of He and SO₂is (molecular mass He = 4, SO₂= 64):

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1:4

16:1

1:16

4:1

Primary, secondary aad tertiary alcohols can be identified and distinguished by

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Lucas test

lodoform test

Baeyer's test

Silver mirror test

"Each different compound should have a different name" was published by IUPAC system of nomenclature in

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1892

1830

1947

1979

The equilibrium constant in a reversible chemical reaction at a given temperature

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Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentration of rectants

It is characteristic of the reaction

At what pH glycine shows the structure H_3N⁺-- CH₂-- COOH

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2

7

10

14

When phenol is reduced in the presence of Zn dust, we get

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Cyclohexene

Cyclohexane

Benzene

Benzyne

Which one is the major reason for pollution in high cities?

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Fossil fuel

Acid rain

Heat dispersion

None of the above

Which of the following process is employed to convert alkyl halide into alcohol?

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Addition

Substitution

Dehydrohalogenation

Molecular rearrangement

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Increase in concentration of 1

Decrease in concentration of I₂

Increase in temperature

Increase in total pressure

Anode is the surface on which probability of finding electron is:

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50%

Less than 10%.

More than 95%.

Zero.

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

A buffer of a 0.09 molar acetic acid and 0.11 molar sodium acetate has pH = 4.83. If 0.01 mole NaOH in 1 dm³of the buffer solution is added, then pH of the buffer becomes

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4.74

4.92

5.0

4.0

Carboxylic acids functional group is:

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----COOH

-----COH

----CO---

----OH

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