Question # 1

Which of the following is thermosetting polymer

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Synthetic varnishes

Epoxy resins

PVC

Both A and B

In Purification of potable water the coagulant used is

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nickel sulpahte

copper sulpahte

barium sulphate

alum

Requirement of macronutrient per acre of the land is

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5 to 200 kg

20-200 kg

200-400 kg

30-400 kg

The total number of 3d-series transition elements is

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10

40

14

58

Acetic acid is obtained from:

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Red out

Vinegar

Butter

Milk

Graham s law refers to

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Boiling point of gases

Gas compression problems

Gaseous diffusion

Volume changes of gases due to change in temperature

Tertiary alcohols are the easiest to dehydrate because

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They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

What will be the pH of 1.0 mol dm -3 of H2X, which is only 50% dissociated

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1

0

2

Less than 0

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 reactions to take place

air must be blowing swifty

there must be SO₂in the air

In order to mention boiling point of water at 110∘C the external pressure should be:-

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between 760 torar an 1200 torr

between 200 torr and 760 torr

765 torr

any value of preessure

Neutron was discovered by:

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Chadwick.

Bohr.

Rutherford.

Plank.

Which alcohol gives only one oxidation product when wormed with dil acidified K₂Cr₂O₇

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Butan-1-ol

Butan-2-ol

2-methyl propan-1-ol

2-methyl propan-2-ol

Phenol is a weak acid. The correct order of acid strength of carboxylic acid, phenol and alcohol is

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Carboxylic acid > phenol > alcohol

Carboxylic acid > alcohol > phenol

Phenol > carboxylic acid > alcohol

Alcohol > phenol > carboxylic acid

The maximum number of electrons in the outermost shall of s-black elements is

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One

Two

Three

Four

The temp. used for the hydrogenation of alkenes using Ni is

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2000°C

400°C

200-- 300°C

1000°C

Which one of the following is a water soluble vitamin?

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Naacin

Riboflavin

Trypsin

Ascorbic acid

Mustard gas is a

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Gas

High boiling speed

High melting liquid

Steam

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

Cyclohexane can be converted not benzene in the presence of

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Pt at 100°C

Pt at 250°C

Pd at room temperature

Pt at room temperature

Ethyl alcohol on oxidation with K₂Cr₂O₇gives

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Acetic acid

Acetaldehyde

Formaldehyde

Formic acid

Which of the following fibres are made of polyamides?

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Dacron

Orlon

Nylon

Rayon

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