Question # 1

Variable electrovalency is due to the following reasons.

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Unstable configuration of core

Inset electron pair effect

All of above

None of above

Proteins have characteristics

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Melting poirn t

Iso electric point

Boiling point

All of these

Which of the following contains isoprene unite.

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Natural rubber

Nylong -6,6

Polyethylene

Decron

NH3 has a not dipole moment while BF3 has zero dipole moment Thsi is because.

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NH3 is not a planar molecule while BF3 is a planar molecule.

NH3 is a planar molecule, while BF3 is a planner molecule.

Fluorine is more electronetative than nitrogen

Born is more electronegative than nitrogen

Iron which contains up to 1% carbon is called.

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Steel

Cast iron

Wrought iron

Pig iron

Which of the following halogen exist in solid state.

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F2

I2

Cl2

Br2

The variation of enthalpy of reaction with temperature is given by.

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Hesse's law

Clasisus Clapayron equation

Kirchoffs equation

Arrhenious equation.

What ASTM test for tension is designated for plastics.

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A 370

D 638

E 292

None of these

Which of the following is not a physical test.

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Colour test

Flame test

Beed test

Wet test

A theoretical link between quantum mechanics and thermodynamic is.

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Electrochemistry

Kinetic theory of gases

Spectroscopic analysis

Statistical thermodynamics

The branch of chemistry which deals with the analysis of chemical products is known as.

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Physical chemistry

Organic chemistry

Inorganic chemistry

Analytical chemistry

Which of the following statements is not correct with respect to applications of Hammett equations.

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It develops a quantitative relationship between structure and reactivity

This equation on can be used to calculate the value of pK_a

This equation does not help to calculate the rate of some reactions

This equation has mechanistic implications

The formula of bleaching powder is.

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Ca OCl2

CaCIO3

Ca(CIO)3)2

CaOCI

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

Bioconversion of biomass can be used for.

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Heating purposes

Power production

Methane production

All of the above

The nitrogen present in some fertilizers helps plants.

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To fight against diseases

To undergo photosynthesis

To produce protein

The most suitable method of separation in mixture of o-and p- nitrophenol is.

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Steam distillation

Chromatography

Ion-exchange

Sublimation

Natural gas can be transported through

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Cylinders

Pipes

Barriers

All of above

Dull red flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

The formula of hexa borane is.

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B4H10

B6 H10

B5 H9

B8 H12

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

The maximum number of electrons in first energy levels are.

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1

2

8

10

Which one of the following has the biggest electron affinity.

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F2

Cl2

Br2

I2

Which of the following pollutants does not a leave a residue.

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Air pollutant

Chemical pollutant

Soil pollutant

Noise pollutant

Which of the following source is commonly used as excitation source in fluorimeter.

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Tungsten lamp

Mercury vapour lamp

Nernst vapur lamp

Radio souse

Ozone layer of stratosphere requires protection from indiscriminate use of.

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Fungicides, insecticides, bactericides and medicines

Aerosols and high flying jets

Atomic explosions and industrial wastes

Weather ballons

Hydrolytic reaction of fat with caustic soda is known as ______

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Esterification

Saponification

Acetylation

Carboxylation

Which of the following is the strongest oxidant.

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F2

Cl2

br2

I2

With which one of the following configurations, the lowest value of first IE is associated.

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Is2, 2s2, 2p6, 3s1

1s2, 2s2, 2p5

1s2, 2s2, 2p6

1s2, 2s2, 2p6, 3s2, 3p2

Which one of the following ions is colourless.

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Cu+

Co2+

Ni2+

Fe3+

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