Question # 1

All 3d series elements show an oxidation state of oxidation state

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+1

+2

+3

Zero

A covalent bond may be

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100% covalent

Partial ionic

100% ionic

Both a and b

A term to express the partial pressure of water vapours in a gas is known as

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vapour pressure

aqueous tension

partial pressure

moisture

Substances that tend to decrease the activity of enzymes are called:

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coenzymes

activators

inhibitors

apoenzyme

Always carboxylic acid produced will have number of carbon atoms from carbon atom in alkyl nitriles:

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One more

Two more

Equal & same

One less

Propanoic acid is functional group isomer of

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Methyl acetate

Ethyl acetate

Propanal

Proparone

In macromolecules DP stands for

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Dissociation parameter

Dissociation polymer

Degree of polymerization

None of these

Liquid hydrocarbon is

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methane

propane

ethane

hexane

The amount of heat required to vaporize one mole of liquid at its boiling point without change in temperature is called

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molar heat of vaporization

molar heat of sublimation

molar heat of fusion

none of these

Coenzymes are the species which increase the activity of enzymes. They are chemically

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Metal ions

non-metals

Organic acids

Organic bases

This is known fact that the molar volumes of different gases at S.T.P. are

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much larger than the molar volumes of liquids and solids

little bit less than the molar volumes of solids

about the same as the molar volumes of liquids

little bit greeter than the molar volumes of liquids

The malt-sugar in the presence of yeast or invertase gives

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Fructose

Glucose

Lignin

Alcohol

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The heat released is enthalpy of neutralization

The heat released is enthalpy of atomization

The heat released is enthalpy of sublimation

The heat released is enthalpy of formation

d-block elements are also called :

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alkali metal

Alkaline earth metals

Transition elements

Electron deficient elements

The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

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207.94

208.24

206.94

207.24

Alkyl halides on treatment with metallic Na give

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Alkynes

Alkenes

Alkanes

Alcohols

The saturated hydrocarbons usually end with suffix ______

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Ane

Ene

Yne

Oic

The equation for the first ionization energy of hydrogen is

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The treatment of benzene with isobutene in the presence of sulphuric acid give

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isobutyl benzene

tert-Butyl benzene

n- Butyl benzene

no reaction

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

Which one of the following is not a nuclelphile

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H₂O

H₂S

BF₃

NH₃

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