Question # 1

Enthalpy of neutralization of strong acids and strong bases have same values because

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Neutralization leads to the formation of salt and water

Acids always give rise to H+ and bases always furnish OH-

Strong acids and bases are ionic substances

The net change involves the combination of H and OH ions to form water

The main pollutant of leather tanneries in the waste water is due to:

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Lead

Copper

Chromium (VI)

Chromium (III)

AgNO₃ is a polymorphic having two different crystalline forms which are

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cubic, tetragonal

monoclinic, hexagonal

cubic, orthorhombic

orthorhombic, rhombohedral

The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called:

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fiber

plastic

varnish

polyamide resin

Which of the following protein has application is food industry

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Globulin

Gelatin

Casein

All

Which substances do not react immediately with bromine water

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Wthane

Benzene

Ethene

Phenol

^{The common oxidation number of halogens is}

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-1

+1

-2

0

Thrombin is locally used to stop

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Heart disease

Bleeding

Blood

None of these

The chemical reactivity of glass is reduced by the use of

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fluxes

formers

stabilizers

none of the above

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

Both E₁and E₂mechanism can be shown by

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1° - RX

2° - RX

3° - RX

None of these

The energy of the system and surrounding is conserved. This is a statement of

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Law of mass action

Law of definite proportion

Law of conservation of energy

Second law of thermodynamics

In CH₄, all the H-C-H bond angles are

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120°

107°

109°

109.5°

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

Dehydration of allcohol gives:

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Alkane

Alkene

Aldehyde

ketone

Denaturation of protein means the structure of protein is disrupted, indicate which factor foes not denature protein

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Heating protein

pH changes

Oxidising agent

Keeping pH 7.35

Which is not true about acetophenone?

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Reacts to form 2,4-dintrophenyl hydrazine

Reacts with Tollen's reagent to form silver mirror

Reacts with I₂/NaOH to form iodoform

On oxidation with alkaline KMnO₄followed by hydrolysis gives benzoic acid

n-butane and iso butane are an example of

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Chain isomerism

Positional isomerism

Meta merism

Functional group isomerism

The number of electron that are paired in oxygen molecule are

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16

12

14

7

The tendency of an atom to attract shared electron pair towards itself is called

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Covelent bond

Electronegativity

Ionization potential

Electronic affinity

The electron in an atom

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moves randomly around the nucleus

has fixed space around the nucleus

is stationary in various energy levels

moves around its nucleus in definite energy levels

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