Question # 1

Which of the following is biodegradable pollutant.

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Domestic waste

DDT

Mercury salta

Aluminum foil

In a period, the element with biggest electron affinity belong to.

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Group 1

Group 2

Group 17

Group 18

Inter halogens are of types.

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3

4

5

6

Which of the following property is not related to aluminum.

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it is silvery white metal with brilliant lusture

It is a very light metal with specific gravity as 2.7

It is good conductor of heat

It is the least reactive element of III Group.

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

CO belong to which group.

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C_2v

D_2h

C_av

D_ah

Which one of the following pairs are chemically dissimilar.

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Na and K

Ba and Sr

Zr and HF

Ca and Zn

Which of the following process is not related with cannot cycle.

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Iso thermal expansion

Adiabatic expansion

Isothermal compression

Isobaric compression

In sodium chloride type lattice, the ratio of coordination number of cation to anion is.

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6:6

7:7

4:8

4:4

The colloidal solution of arsenic sulphide prefers to absorb

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NO3

K+

S2-

H+

The ions Sc3+ , Ca2+ and K+ have same electronic configuration as that of.

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Neon

Argon

Krypton

Xenon

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

Which of the following statement is not related with the effect of thermal pollution.

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Decrease in BOD

Increase in BOD

Reduction in DO

Change in algal production

Lead pencil contain

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Lead

Lead sulphide

a mixture of lead and silica

graphite

Which of the following statements is not correct with respect to applications of H- bonding.

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It explains the usual b.p. and m.p of certain class of compound.

It explains the solubility of certain organic compounds in hydroxylic solvents

It explains the lack of ideal behavior in gases and solutions

It has stonrg influence on the configuration of certain molecules.

The suffix '-ene' in the name of fullerene shows the presence of ___ in the molecule.

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One triple bond

One double bond

Two single bonds

Two triple bonds

Most commercial glasses consist of

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Lime

Soda

Silica

All

Which of the following statement is not related with high quantum yield reasons.

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Formation of reactive intermediates which may act as catalyst

The active molecules may collide with other molecules and activates these molecules.

The reaction may be exothermic and heat evolve may activate other molecule

The primary photo chemical process may be reversed

Which of the following configuration is associated with biggest jump between second and third IE.

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1s2, 2s2, 2p2

1s2, 2s2, 2p6, 3s1

1s2,2s2,2p6, 3s2

1s2, 2s2,2p6

Which of the following analytical technique is used for the separation of an interfering substance or analyte from the mixture.

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Precipitation

Distillation

Electrode position

All above these

Which of the following process is involved in the purification of crude metals.

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Liquation process

Oxidation process

Distillation process

Electro refining

What is the advantage of quench hardening?

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Imporoved strength

Hardness

Wear characteristics

All of the choice

Presence of nitrogen in organic compound to tested as.

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Nitrogen gas

NH3

NO

Amide

Refining is

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Extracting petroleum gas

Separation of various fraction

Heating of coal

All of above

Ground water is threatened with pollution from which of the following source.

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Domestic wastes

Industrial wastes

Agricultural wastes

All above

In each period the element with lest electron affinity belongs to.

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Group 1

Group 14

Group 17

Group 18

The order in O2+ is

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1.0

1.5

2.0

2.5

In vinyl cyanide, the number of a bonds in

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2

3

1

4

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide or comentite

Graphite

Partly as iron carbide and partly as graphite

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

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