Question # 1

Borax exist in the form

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Ordinary borax

Octahdral borax

Borax glass

All above

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

The pH of milk is

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6.0

6.5

7.0

7.5

Which of the following statements correct regarding copper.

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It is used in electroplating

Its salts are used as insecticides

Its salts are used as coloring materials

All are correct

The concentration required to give a signal equal to three times the standard deviation of the baseline is called.

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Sensitivity

Detection limit

Signal to noise ratio

None of the above

The pink colour of phenolphthalen in in basic medium is due to the

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Cationic form

Anionic form

Natural form

OH- ions of the base

All bond length in benzene are identical due to.

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Resonance effect

Inductomeric effect

Electromeric effect

Mesomeric effect

The bond order for BO molecule is.

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2.5

3.0

2.0

3.5

Which of the following statements is false about enantiomers.

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Rotate plane of polarized light

Are superimposable mirror images

Nbonsuperimposable mirror images

All of the above

The process of heating to redness and then slow cooling in known as

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Tempering

Annealing

Quenching

Hardening

Linear molecules have ____________ axis of rotation

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C1

C2

C

C3

The process of removing disolved impurities from a colloidal system, by means of diffusion through a suitable membrane under the influence of an electric field , is called.

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Electrosmosis

Electrodialysis

Electrophoresis

Peptization

Which of the following haloacids is stronger acids.

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FCH2COOH

ClCH2COOH

Br CH2COOH

ICH2COOH

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

Zero group elements are called as

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Inert gases

Rare gases

Noble gases

All of above

The agricultural field that produces maximum methane gas into atmosphere is

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Wheat field

Paddy field

Cotton field

Groundnut field

Which of the following analytical technique is used for separating similar substance by preferential adsorption or partition between two phases.

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Distillation

Dialysis

Chromatography

Solvent extraction

The chief ore of aluminium is.

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Cryolite

Bauxite

Kaolin

Carnalite

At higher altitudes, the boiling point of water is lowered because.

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Atmospheric pressure is low

Temperature is low at high altitude

Atmospherics pressure increase

None of the above

Photochemical smog consist of excessive amount of X in addition to aldehydes ketones, PAN etc. X is.

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Methane

Carbon monoxide

Ozone

Carbondioxide

Which of the following is renewable resources of energy.

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Hydropower

Wind power

Solar power

All above

Which of the following metal acts as pollutant.

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Hg

Pb

Zn

Ni

All above

1 meter = ___________ nm

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10⁹

10^-9

10¹⁰

10^-10

Which parameter of a chemical reaction will change with the use of a catalyst.

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Delta F, change in free energy

Delta S, change in entropy

Delta E , change in internal energy

K, the rate constant

What is the most undesirable of all the elements commonly found in steels.

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Sulphur

Phosphorus

Silocn

Magnesium

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

Which of the following technique is used to separate substance of high molecular weight of different charges.

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Dialysis

Electrophoresis

Solvent

None of the abvoe

Which of the following has the greatest metallic character.

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Na

Mg

Al

Si

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

The most stable carbonium ion is

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See butyl

n-butyl

Tert butyl

None of the above

The experimental relationship between rate of the reaction and concentration of the reactants is called.

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Rate law

Law of mass action

Le-Chatelier's principle

Rate constant

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