Question # 1

Content of carbon in steel is:

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0.12 to 0.25%

0.25% to 2.5%

3.0 to 3.5%

4.0 to 4.5%

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

Which of the following alkyl halides is used as a mathylating agent

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CH₂H₅l

CH₃l

C₂H₅Pr

C₂H₅Cl

The solubility product of AgCl is 2.0 x 10^-3 mol² dm^-6 , The maximum concentration of Ag ion in the solution is :

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2.0 x 10^-10 mol dm^-3

1.41 x 10^-10 mol dm^-3

1.0x 10^-10 mol dm^-3

4.0x 10^-10 mol dm^-3

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent

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A ketone

An aldehyde

An ether

Water

K_bfor NH₄OH is 1.81 x 10^-5, then K_avalue of its conjugate base is

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1.81 x 10⁺⁵

1.81 x 10^-9

5.5 x 10^-9

5.5 x 10^-10

The alkyl halide molecule on which a nucleophile attacks is called

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Substrate

Subsituent

Substituted

All of these

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Temperature is increased

Pressure is increased

HCl is added

HCl is removed

The apex angle of the folded filter paper is slightly greater is termed as:

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60 degree

30 degree

45 degree

90 degree

The number of unpaired electrons in ferrous ion ( Z - 26) is

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3

2

4

5

Among the nitrogen containing fertilizer, the one with about 82% nitrogen content is

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Ammonium nitrate

Ammonia

Ammonium phosphate

Ammonium sulphate

Strong oxidizing agents have

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Greater positive value of standard reduction potential

Lesser positive value of standard

Greater negative value of standard

None of these

Which of the following does not give iodoform test?

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Ethanol

Ethanal

Acetophenone

Bezophenone

Which of the following is the hardest metal among following

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Li

Na

Rb

K

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Measuring pH

Measuring density

Titration against standard NaOH

Titration against standard KMnO₄solution

A transition metal complex can be recognized by various terms. Which is not the proper term

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Central metal ion

Coordination number

Ligand

Geometry of complex

Which compound has the maximum repulsion with water?

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃----O---CH₃

What is the most common catalyst used in hydrogenation of oils

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Cobalt

Nickel

Tungsten

Copper

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

None of these

Fossil fuels consist of :

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Coal

Natural gas

Petroleum

All of these

Which species represented by the following formula has the largest radius

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P^3-

Cl^-

A_r

K⁺

Swage water is purified by

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Microorganisms

Light

Fishes

Aquatic plants

Carboxylic acids on complete reduction in the presence of Hi and red phosphorus gives:

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Esters

Alcohols

Alkanes

Aldehydes

Environmental pollution affects

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Biotic components

Plants only

Man only

Biotic and abiotic components of environment

Replacement of hydrogen by NO₂group is called

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Sulphonatioin

Hydration

Nitration

Cracking

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High temperature

Low temperature

Low pressure

High pressure

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Complete conversion of A to B has taken place

Conversion of A to B is only 50% complete

Only 10% conversion of A to B has taken place

The rate of transformation of A to B is just equal to rate of transformation of B to A in the system

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Diastase

Lipase

Inverters

Zymase

During a chemical reaction heat may be

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absorbed

Evolved

Both evolved and absorbed

None of these

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