Question # 1

The substance upon which an enzyme acts is known as its

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domain

field

substrate

reactant

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

The system in which all the three axes are unequal and are at righ angle to each other is called

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cubic

hexagonal

orthorhombic

tetragonal

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

Purines include

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Adenine

Guanine

Both a and b

None

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

A basic buffer solution can be prepared by mixing

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Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Weak acid and its salt with strong base

In which of the following processes are small organic molecules made into macromolecules

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethene

The hydrolysis of protein

Ethylene reacts will 1% cold alkaline KMnO₄to give

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Oxalic acid

Acetone

Ethylene glycol

Formaldehyde

Ketones are prepared by the oxidation of:

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

A colourless liquid, at room temperature reacts with soda lime to form sodium salt of carboxylic acid and ammonia gas. The liquids is

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Propanamide

Propanoic acid

Formamide

Methyl Ethanoate

Electrolytes in the form of solution or in the fused state have the ability to conduct :

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Light.

Electricity.

Ions.

Electrons.

f-Block elements are also called

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Non typical transition elements

Outer transition elements

Normal transition elements

Inner transition elements

Which reagent is used to reduce a carboxylic group to an alcohol

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H₂/Ni

H₂/Pt

NaBH₄

LiAIH₄

A homogeneous mixture of two or more than two chemical substances is called

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Solute

Solution

Solvent

Salvation

The elements in which d or f-orbitals are incomplete are called

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Transition elements

Typical elements

Actinides

lanthanides

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Addition Elimination

Addition Reduction

Elimination Reduction

Substitution Elimination

Heavy water is obtained by

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Prolonged electrolysis of water

Dissolving heavy salt in water

Simple distillation of water

Removing impurities of calcium and magnesium form water

Which set of hybrid orbitals has planar triangular shape

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sp³

sp

sp²

dsp²

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