Question # 1

Glass is a

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Micro-crystalline solid

Super-cooled liquid

Gel

Polymeric mixture

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

Proteins loose their ability to work

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by slight heating

by change in structure

by slight cooling

when inside the body

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

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

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

Which fiber contains 85% acrylonitrile by weght?

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azlon fiber

saran fiber

acrylic fiber

rayon fiber

Absolute temperature of a gas is proportional to:

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Rotational Kinetic energy

Translational Kinetic energy

Vibrational Kinetic energy

Potential energy

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

Factors affecting denaturation of proteins:

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Change in temp and pH

Strong reducing agent

Strong oxidizing agent

All of these

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

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Hydrolysis of Grignard's reagent gives:

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Alkane

Alkyl

Halide

Alcohol

Which of the following elements does not show variable oxidation states?

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Copper

Iron

Zinc

Titanium

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

H-bonding is not present in

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Glycerine

Water

Hydrogen sulphide

Hydrogen fluride

Phenols are derivative of:

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Alkanes

Alkenes

Alkynes

Benzene

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

Which has greater number of moles

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0.1 g sodium

6.02 x 10²⁰atoms of magnesium

20 cm³0.1mole per dm³of NaOH

12.2 dm³of nitrogen at standard

[A_rNa = 23, Mg = 24, O = 16]

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Elimination Esterification

Elimination Isomerisation

Oxidation Exterification

Oxidation Oxidation

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