Question # 1

The process requirieng the absorption of energy of.

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F = F

Cl = Cl

H = H

O = O

Proper proportioning of concrete, ensures

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Resistance to water

Desired durability

Water tightens of the structure.

All

In DTA , theriac effect may be exothermic of endothermic These are cause by

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Fusion

Crystal structure inversion

Destruction of crystal lattice

All of above

Which of the following techniques are used for minimizing water pollution.

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Stabilization of ecosystem

Recharge of the waste

Waste treatment

All above

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

CFT was originally applied to.

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Ionic crystal

Liquid crystal

Solid crystal

All above

Which group contains elements that exist as monoatomic molecules.

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1

2

14

18

An example of acyclic monotterpenoid is

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a -pinene

Camphor

Geranial

Citral

[Ti(OH2)6]3+ gives colour

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Green

Red

Purple

Blue

When a lead a storage battery is discharged .

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SO2 is evolved

PbS is consumed

Pb is formed

H2SO4 is consumed

Which of the following pollutants results from chemicals petroleum and paper industries.

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SO2

CO

Hydrocarbons

All above

CFSE for d⁷ ion is.

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0.8

-0.8

-1.8

1.8

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

The branch of chemistry which deals with the rate of reaction as well as mechanism is known as

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Wave mechanism

Classical thermodynamcis

Chemical kinetics

Phtochemistry

The atomic number of potassium is 19 and that of mangness is 25 Although the colour of MnO4 is dark violet yet the K+ is colourless this is due to the fact that.

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Mn is a transition element while K+ is not

[MnO4]- is negatively charged while K+ has positive charge

The effective atomic number of Mn is [MnO4]- is 26: while for K+ the atomic number is 18

The Mn is a high positive oxidation state allows charge transfer transitions.

The most common oxidation state of alkaline earth metals is.

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+1

+2

-2

-1

Which of following is used as make up chemical in Kraft process.

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Na2CO3

KCl

Na2SO4

NaOH

Which element are non metals.

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N & P

Sb & Bi

As & Sb

N & Bi

An emulsifier is an agents which

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Stabilizes an emulsion

Homgeneises and emulsion

Causes coagulation of an emulsion

Helps in the formation of an emulsion

Which of the following is not a property of Ni.

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it is a soft silvery white metal

It is malleable and ductile

It is highly magnetic

It has high electrical and thermal conductivities

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

A trace constituent is one whose amount in the sample is.

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< 10%

< 010%

< 1.0%

< 0.01 %

The temperature at which two conjugate solutions change into one homogeneous solution is called.

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Azeotrope

Conjugate temperature

Consolute temperature

Transition temperature

The Langmuir theory of unimolecular adsorption is generally valid at.

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Low pressures and low temperature

Low pressures and high temperature

High pressures and low temperature

High pressure and high temperature

Which of the following is not an alkali metal

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Rb

Sb

Cs

Fr

HS- is a conjugate base of.

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S2-

H2S

H2SO3

H2SO4

Which of the following process is not involved in the purification of bauxite.

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Bayer's process

Serpek's process

Hall's process

Goldsmith's process

Acid rain effects

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Human being

Crops

Aquatic life

All above

Which of the following system has low as well as upper consolute temperature.

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Nicotine - water

Aniline -water

Triethlylamine -water

Phenol -water

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

Which of the following statement is not relevant with nitrous oxide.

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It is a colorless and odourless gas

It is non toxic gas

It is present in the atmosphere in higher concentration

It has high reactivity in the lower atmosphere

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