Question # 1

Electrons in 5d energy level are filled up in case of

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Lanthanides

Transition metals

Actinides

Rare gases

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

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

Properties of polymeric material depends upon

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Chemical composition

Structure of molecule

Boiling point

Both A and B

The substances which soften the polymer are called

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stabilizers

plasticizers

retarders

pigments

The starting substance for the preparation of iodoform is any of the following, except

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СН3СН(ОН)CН3

CH3CH2ОН

HCH2OH

CH3COCH3

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will:

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reduced to 1/4

be double

increases four times

remains unchanged

CFCs are mainly used in industries due to

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Low cost

Gaseous nature

High reactivity

Un stability

Which is most acidic?

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H2O

C2H5OH

C4H9OH

CH3-CH2-CH2OH

consider the physical properties of the gases. Which of the following statements about particles of gases is incorrect? The particles are:

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causing pressure

having wide spaces

orderly arranged

randomly moving

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

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1.78

2.78

3.78

4.78

Use of ethanol as:

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Drink

Solvent and fuel

In beverage

All of these

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Select from the following the one which alcohol

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There is no change in temperature

No change in volume

Heat is absorbed

Heat is released

Aldehydes are reduced to :

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Pri-alcohol

Sec-alcohol

Ter-alcohol

All of these

A species having positive or negative charge is called:

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Electron

Ion

Proton

Atom

The element with atomic number 26 will be found in group

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2

8

6

10

Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

Which of the following compounds will react with reagent ?

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CH₃ CO H

CH₃ CO CH₃

CH_{3 COOH}

CH₃CO CH₂CH₃

On alkali and alkaline earth metals down the group, there is decreasing trend in

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m.p.

b.p.

Ionization potentiall

All of these

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