Question # 1

Which is not the condition for the formation of smog

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There must be sufficient NO gas

There must be sunlight to help photo chemical reaction to take place

Air must be blowing swiftly

There must be SO₂in the air

UV radiations bring about

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Skin cancer

Mouth cancer

Lung cancer

Liver cancer

When ammonia is heated with cupric oxide, a molecule of ammonia will

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Gain 3 electrons

Lose 3 electrons

Gain 2 electrons

Lose 2 electrons

Which of the following is not an element?

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Graphite

Diamond

22-Carat gold

Rhombic sulphur

The relation between Kc and Kp is

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Substances that tend to decrease the activity of enzymes are called

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Coenzyme

Activators

Inhibitors

Apoenzyme

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0.5

4.0

2.5

0.25

Which one of the following substance is use as decolonizing agent

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Asbestos

Animal charcoal

conc, H₂SO₄

Silica gel

Reductive ozonolysis of benzene produces

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Acetone

Maleic anhydride

Phthalic acid

Glyoxal

When a colourless gas is passed through bromine water only decolourisation takes place the gas is

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SO₂

HBR

HCl

H₂S

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

The spectrum of helium is expected to be similar to that of

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H

Li⁺

Na

He⁺

Which of the statements given below concerning properties of solution, describe a colligative effect?

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Boiling point of pure water decreases by the addition of ethanol

Vapour pressure of pure water decreases by the addition of nitric acid

Vapour pressure of pure benzene decreases by the addition of naphthalene

Boiling point of pure benzene increases by the addition of toluene

Which quantum number is sufficient to describe the electron is hydrogen atom?

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l

n

m

s

Which element does not belong to 3d transition series

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Ti

V

Mn

Te

Best medhod of preparation of alkyl halide from alcohals is by its reaction with:

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HX

SOCl₂

Px₅ and PX₃

All

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

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Cathode rays travel in straight lines

Cathode rays are negatively charged

Cathode rays produce x-rays

Cathode rays are material particles having momentum

At room temperature, the mole fraction of a solution in 0.25 and the vapour pressure of the solvent is 0.80 atm. Then the lowering of vapour pressure is

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0.75

0.512

0.80

0.0512

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

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2,1,0

2,1,1

3,1,1

3,2,1

A solution contains 1.2046 x 10²⁴hydrochloric acid molecules in one dm³of the solution. The strength of the solution is

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6 N

2 N

4 N

8 N

H₂+ L₂----2Hl

In the above equilibrium system, if the concentration of reactants at 25°C is increased, the value K_C will :

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Remains Constant

Increases

Cecreases

Depends upon nature of reactans

Acid rains are produced by

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Excess NO₂and SO₂from burining fossil fuels

Excess production of NH₃by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂by combustion and animal respiration

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Which of the following gives iodoform on heating with a solution of I₂containing Na₂CO₃?

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Ethyl alcohol

Acetone

Ethyl alcohol as well as acetone

Methyl alcohol

The general formula of saturated alicyclic hydrocarbons is:

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C_nH_n

C_nH_2n

C_nH_2n+2

C_nH_2n-1

Which of these polymers is an addition polymer

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Nylon 6,6

Polystyrene

Terylene

Epoxy resin

Which three elements are needed for the healthy growth of plants

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N, S, P

N, Ca, P

N, P, K

N, K, C

Which metal of Group-II A of the periodic Table, will form the least ionic chloride

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Be

Mg

Ca

Sr

Freezing point depression is measured by

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Beckmann's apparatus

Lands Berger's method

Antifreeze apparatus

All of the above

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

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