Question # 1

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

The amino group in 19 alpha-amino acids is primary; only one alpha-amino acid has secondary amino group which one is that

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Alanine

Glutamic acid

Glycine

Proline

one gram of carbohydrate yields energy:

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10kcal

100kcal

4kcal

9kcal

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

Coinage metals Cu. Ag, and Au are the least reactive because they have

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Negative reduction potential

Positive reduction potential

Negative oxidation potential

Positive oxidation potential

The elements for which the value of ionization energy is low can

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Gain electrons readily

Lose electron less readily

Gain electrons with difficulty

Lose electron readily

Equal volume of all gases at same temperature and pressure contain number of molecules:

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multiples

equal

different

in fractions

Glyoxal molecule has?

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two carbonyl groups

One aldehydic and one carbonyl group

Two aldehydic groups

Two carboxyl group

The rate of diffusion of a gas is inversely proportional to:

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Density of a gas

Velocity of the gas

Viscosity of the gas

All of above

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

An oil or fat with no double bond have iodine number:

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Zero

100%

50%

minimum

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.2965 V at 25°C. The equilibrium constant of the reaction would be

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1.0 x 10¹⁰

2.0 x 10¹¹

4.0 x 10¹²

1.0 x 10²

The ionization potential is lowest for the

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Halogens

Inert gases

Alkaline earth metals

Alkali metals

After chlorination, the pulp is washed at:

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20°C

30°C

40°C

60°C

The branch of chemistry which deals with thermal energy changes in chemical reactions is called

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Chemical kinetic

Thermodynamics

Thermochemistry

Mechanics

Which of the following enzymes brings about the hydrolysis of fats?

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Urease

Maltase

Zymase

Lypase

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-Burnt Hydrocarbons

All of these

An azeotropic mixture of two liquids boils at a lower temperature than either of them when lower temperature

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It is saturated

it shows positive deviation from Raoult's law

It shows negative deviation form Raoult's law

It is metastable

Heat,. work and internal energy of the system and surroundings are related into an equation which is called

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First law of thermodynamics

Hess's law

Henry's law

Born-haber cycle

A solution of glucose is 10% The volume to which 1g mole of it dissolved will be :

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8.1 dm³

1.7 dm³

1.8 dm³

6.1 dm³

Calculate the amount of charge flowing in 2 minute in a wire of resistance 10Ωwhen a potential difference of 20 V is applied

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120 C

240 C

20 C

4 C

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