Question # 1

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

Which element of group V-A and VII-A does not use d-orbital?

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Nitrogen

Sulphur

Arsenic

Chlorine

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Which statement is incorrect

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pH and [OH-] are inversely related to cach other

pOH and [OH-] are inversely related to each other

pH and [OH-] are directly related to each other

pOH means potential of hydroxyl ion concentration

Which of the following is a base according to lowery Bronsted concept?

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I-1

HCl

H3O+

NH4+1

Which is unnecessary for purification of water for drinking purpose?

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Coagulation

Treatment with iodine

Aeration

Chlorination

As gases can adopt the shape of the container. Therefore gases have:

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different shapes

fixed shapes

no fixed shapes

definite shapes

By the mid of 1980s depletion of total overhead ozone in antarctic region is

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20%

30%

40%

50%

Which of the following bonds is not present in NH4CL

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lonic bond

Covalent bond

Co-ordinate covalent bond

De-localized covalent bond

Coordination number of Zn and ZnS (Zinc blends) is

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4

6

2

None of these

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Substances that tend to decrease the activity of enzymes are called

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Coenzyme

Activators

Inhibitors

Apoenzyme

The total number of inner transition elements in the periodic table is

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10

14

28

30

The presence of a double bond in a compound is the sign of

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Saturation

Unsaturation

Substitution

None of above

Which of the followingα-Amino acids has basic R-group

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Proline

Glutamic acid

Histidine

Valine

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[A] = [B]

[A] < [B]

[B] = [C]

[A] > [B]

K_bvalue of NH₄OH is 1.81 x 10^-5and its conjugate acid has K_a= 5.7 x 10^-10pKb of the base is 4.74, pKa of its conjugate acid is

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-4.74

4.74

10

9.26

Formic Acid is obtained from Red out by:

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Distillation

Crystallization

Filtration

sublimation

Caroxyl group has functional in it.

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one

two

three

four

The benzene molecule contains

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Three double bonds

Two double bonds

One double bonds

Delocalizedπ-electron charge

Benzene hexachloride is used as

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Dye

Antimaterial drug

Antibiotic

Insecticide

Splitting of spectral lines when atoms are subjected to strong electron field is called

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Zeeman effect

Stark effect

Photoelectric effect

Compton effect

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