Question # 1

Deep sea divers breath air under increased pressure, therefore they use a mixture of

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96% N₂and 4% O₂

96% O₂and 4% N₂

94% N₂and 6% O₂

94% 0₂and 6% N₂

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

The thickness of ozone layer is:

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25----50 km

3km only

25---28 km

1 km only

Which of the following are responsible for the colour developed in transition elements compounds?

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s-orbitals

p-orbitals

d-orbitals

f-orbitals

Which of the following is not a property of crystalline solid

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geometric shape

cleavage plane

anisotropy

isomerism

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

Which is the optimum temperature for the activity of enzyme

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20 - 35°C

10 - 15°C

55 - 70°C

35 - 55°C

Ricket is caused due to the deficiency of vitamin

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A

D

B

E

Which of the following is an example of diffusion?

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Spreading of smell of flowers in garden

Steam condensing on a cold window

Bubbles rising in a beaker of boiling water

All of above

In Boyle's law which of the following pair remains constant:

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Temperature and quality of a gas.

Pressure and quality of a gas.

Temperature and pressure.

Temperature and quantity of a gas.

The fibre which contains polymers of vinylidine chloride as fibre forming substance is known as

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Saran fibre

Nylon

Polyester

Acetate fibre

Stainless steel contains Cr upto

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12%

18%

10%

5%

Sodium can be obtained by :

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Electrolysis of acidified water.

By heating NaCl and water at 100°

Electrolysis of molten sodium chloride.

Electrolysis of aqueous sodium chloride.

Which of the following has highest bond order

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Hybridized in oxygen is:

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sp

sp²

sp³

dsp³

Which compound is more soluble in water

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C₂H₅OH

C₆H₅OH

CH₃OCH₃

n-hexanol

In physical and chemical properties, transition elements show

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Similarities

Dissimilarities

Both of these

Somestimes similarities, sometimes dissimilarities

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Br_2(aq)

2, 4-dinitrophenylhydrazine

NaBH

Tollen's reagent

Which of the following is not related to transition metals

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They have a high tensile strength

They are ductile

They are malleable

They have low melting points

Which metal is used in the thermit process because of its activity?

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Iron

Copper

Alumnium

Zinc

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

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