Question # 1

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

Which one of the following is not correct.

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Ar is used in electric bulbs

Kr is obtained during radioactive decay

Boiling point of H2 is lowest among all noble gases.

Xe forms Xe OF4

The change in the concentration of the reactant of product per units time is called.

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Order of the reaction

Melecularity of the reaction

Rate of reaction

None of the above

The alternate feasible fuel for existence of mankind to

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Uranium

Wood

Bontonite

Cloth residues

The pH of water 7 at 25 ^oC if water is heated to 70^oC . Which of the following should be true.

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pH will decrees

pH will increase

pH will remain constant

None of these

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

The size of quantum dot is ________________m

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5

5 x 10^-9

5 x10^-10

5 x10^-11

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

Which of the following compounds would you use in order to obtain a crystalline derivative of an aromatic amine.

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2,4 Dinitrophenyl hydrazine

Nitrous acid

Benzoyl chlride

None of these

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

Equal volumes of all gases, under similar conditions of temperature and pressure, contain equal number of molecules. This is a statement of.

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Graham's law

Dalton's law

Avogadro' law

Boyle's law

The following alloys are the chief alloys that are die cast except.

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Zinc alloys

Magnesium alloys

Manganese alloys

Nickel alloys

Pick out incorrect statement about K2Cr2O7

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It oxidizes acidified solution H2SO4 to S

It oxidizes KI to I2

It oxidizes HCl to Cl2

It gives oxygen, when treated with cold conc. H2SO4

A gas obeying the van Waals equation will closely resemble and ideal gas if

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The parameters 'a' and 'b' are small

'a' is small but 'b' is large

'a' is large but 'b' is mall

None of the above

Which of the following analytical technique is not concerned with atomic spectroscopy.

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Flame photometry

Flame emission spectrometry

Atomic absorption spectrometry

I-R spectrophotometry

Select the major product obtained from the addition of HBr to I -Methyl cyclohexene

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1-bromo -2- methyl cyclohexane

6- bromo-i- methyl cyclohex -i- ene

3- bromo -1- methyl cyclohex - 1- ene

I-bromo -I- methyl cyclohexane

Lactic acid is a molecule which shows

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Epimersim

Tautomerism

Opical isomerism

Metamerism

Which of the following salt is water insoluble.

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K2SO4

Na2SO4

BaSO4

None of abvoe

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of above

The main active contaminants of nuclear reactors are.

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Co- 60

Mn -54

Sr-60

All above

What refers to a shape achieved by allowing a liquid to solidify in a mold.

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Casting

Molding

Forming

All of the choices

Which of the following makes the motion of perpetual motion machine a physical impossibility.

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

The Boltzmann law

Which of the following substance is generally not considered an air polutant.

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CO

CO2

SO2

NO2

Each fat or oil in made up of

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A distinctive mixture of several different triglycorides

A distinctive mixture of several aldehydes

Mixture of above both

None of above

Any property whose magnitude is independent of the amount of substance present is called a/an

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Extensive property

Colligative property

Structural propety

Intensive property

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

The most harmful components of incomplete combination are generally groped as particulate polyclic matter organic (PPOM) These materials are derivatives of .

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Benzene

Naphthalene

Benz a pyrene

None of the above

Which of the following elements forms maximum number of compounds.

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Carbon

Silicon

Hydrogen

Fluorine

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

When steam is passed over red bot coke The product formed is

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Hydrogen and carbon dioxide

Mixture of hydrogen and carbon monoxide

Mixture of hydrogen and oxygen

Heavy hydrogen

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