Question # 1

Bromine is obtained on a commercial scale from

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Caliche

Carnallite

Common satl

Cryolite

1 mole of CH₄contains

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6.02 x 10²³atoms of H

4 g-atom of hydrogen

1.81 x 10²³molecules of CH₄

3.0 g of carbon

The pore size of filter paper depends upon

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Nature of the medium

Temperature of the medium

Size of particles

Mass of the particles

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

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Magnesium

Zinc

Copper

Sodium

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

Cl2 > Br2 > F2

Cl2 C12 > Br2

F2 > Br2 > C12

Hypo is used to photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

The percentage of oxygen in NaOH is

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40

60

8

10

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

The relative rates of diffusion of a gas (molecular weight = 128) as compared to oxygen is

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2 times

1/4

1/8

1/2

A solution of sodium sulphate was electrolysed using some inert electrodes. The products at the electrodes are

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O_2,H₂

O_2,Na

O_2,SO₂

O_2,S_2O^2-₈

Hydrolytic conversion of sucrose into glucose and fructose is known as

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Induction

Inversion

Insertion

Inhibition

Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

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Their metallic character decreases

The stability of +2 oxidation state increases

Their ionization energy increases

Their atomic size decreases

Which of the following as a molecular diseaes?

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Allergy

Cancer

German measles

Sickle cell anemia

Which has largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

The substance used as a smoke screen in warfare is

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SiCl₄

PH₃

PCl₅

Acetylene

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

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Mercury

Lead

Nitrogen oxide

Sulphur oxide

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