Question # 1

Which of the following test is not given by aldehvde

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2. 4 DNPH test

NaHSO3 test

Tollen's test

Sodium nitroprusside test

Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that cause contamination of fresh water?

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Rain

Oil leaks-& spills

Livestock waste

Disposal of industrial effluents

For an ideal gas,number of moles per litre in terms of its pressure P,gas constant R and temperature T is

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PT/R

PRT

P/RT

RT/P

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

Critical temperature of argon's gas is low. the reason is that

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it contains four lone pairs

it is mono atomic gas

it has as smell signed

its polarizability is low

In the esterification, first attack is due toon carborylic acid

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Hydrogen ion

Alcohols

Water

All

Which of the following statements is incorrect about vitamins

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often function as coenzymes

molecules contain at least one ring structure

are often synthesized by the body

are polyfunctional compounds

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Dalton's law finds its application during the process of:

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Digestion

Respiration

Reproduction

All of above

Hess's law is analogous to

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Law of heat summation

law of increasing entropy

Law of heat exchange

Ist law of thermodynamics

The cause of minamate disease is the pollution of:

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arsenic (As) into atmosphere

industrial waste having Hg

organic waste in drinking H₂O

oil spills in H₂O

When nitrogen is 5.6 grams in NO₂. then number of moles of NO₂is

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0.5

0.4

0.04

0.05

Phenol is also known as

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Acetic acid

Carbolic acid

Tararic acid

Trichloroacetic acid

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

The amount of heat evolved or absorbed in a chemical reaction, when the molar quantities of products and reactants being the same as represented in chemical equation. is called

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Heat of reaction

Free energy of reaction

Entropy of reaction

None of these

The number of unpaired electrons in Mn²⁺is

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5

4

3

2

Swage water is purified by

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Microorganisms

Light

Fishes

Aquatic plants

Odour of alkene is:

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Fruity

Odourless

Zarlic like

Irritating

The 95.5% mass of Lithosphone is made of 11 elements i.e. O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. which element is present in trace amount

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Iodine

Bromine

Lead

Carbon

When a carboxylic acid reacts with a metal ______ gas is evolved

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H₂

CO₂

CI₂

None of these

If the radius of first Bohr orbit be a_o, then the radius of third Bohr orbit would be

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3 x a_o

6 x a_o

9 x a_o

1/2 x a_o

A compound used as eye wash:

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Borax

Boric acid

Metabolic acid

Pyroboric acid

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