Question # 1

Hydrogen has ________________ isotopes.

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1

2

3

4

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

Gold was used for utensils as early as ____________ BC.

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3400

3500

3600

3700

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

Solid particles possess which one of the following motions?

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rotational motions

vibrational motions

translation motions

both translational and vibrational motions

Force per unit area is called:

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volume

pressure

weight

density

Neuron was discovered by

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Sir Willium Crooks

Goldstein

James Chadwik

Neil Bohr

Industrial chemistry deals with the manufacturing of compounds:

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in the laboratory

on micro scale

on commercial scale

on economic scale

Solids are fixed ____________

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Shape

Velocity

Mass

Atoms

The no.of electrons in the valence shell of noble gases is

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1

6

7

8

Which of the following can accommodate 18 electrons?

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K

L

M

N

Natural source of citric acid is:

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Rancid butter

Fats

Lemon

Sour milk

Main component of natural gas is

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Methane

propane

Butane

Propene

The value of constant of ionic product of water Kw at 25 C.

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1.0 x 10^-4

1.0 x 10¹⁴

1.0 x 10^-4

1.0 x 10⁴

Temporary hardness is because of .

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

Bronsted and Lowry presented their theories of acids and bases in

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1785

1787

1923

1925

The ability of carbon atom to form chain is called.

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Isomerism

Catenation

resonance

Condensation

Molecular formula of butane is

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C₄H₈

C₄H₁₀

C₄H₁₂

C₄H₆

Which types of reaction speed up gradually?

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Irreversible reactions

Reversibel reactions

Forward reactions

Decomposition reactions.

Manufacturing of urea involves:

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2 steps

3 steps

4 steps

5 steps

50% dextrose contains approximate amount of energy.

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250 calories

16 Calories

170 calories

120 calories

Vitamin are accessory Growth factors they play important role in our body like.

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Provide energy to the body.

Insulate our body from electric shock

Build brain cells

Regulate metabolism

Suppose a new element 'J' has discovered and has seven electron in the valence shell. Which statement about this element would be correct.

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It is monatomic

It form covalent bond with hydrogen

It forms stable positive ion

It forms covalent bond with group IA element

Which bond has more ionic characters in it.

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C - F

N - F

O - F

F - F

If we want to change O₂to O₂^-1The electron is to be placed in

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Acetone and chloroform are soluble in each other due to

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Intermolecualr hydrogen bonding

Dipole-dipole interaction

Instantaneous dipoles

All of the above

Molecule in which the distance between two carbon atoms in the largest is.

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C2H6

C2H4

C2H2

C6H6

The electrode reaction of a voltaic cell can be reversed when

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Concentrations of solutions are changed

Temperature is increased

Electrodes are interchanged

Electric circuit is employed to supply the source of electricity

A chemical change always involve

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Absorption of heat

Evolution of heat

Either absorption or evolution of heat

The liberation of heat and light energy

The largest number of molecule are present.

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

The electron in a subshell is filled according to formula.

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2n²

2(2l+1)

(2l+1)

None of these

If absolute temperature of gas is doubled and the pressure is reduced to one half, the volume of the gas will.

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Remain unchanged

Increase four times

Reduce to 1/4

Be doubled

Which group when attached with benzene increases electron density of ring.

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-COOH

-NO

-CHO

-CH3

Phenol on heating with concentrated nitric acid forms

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o-nitrophenol

T.N.T

Na2CO3

Cyclohexanol

Out of all the elements of Group V-A the highest ionization energy is possessed by

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N

P

Sb

Bi

Plastics are a pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

Secondary alkyl halides are those in which halogen atom is attached with a carbon atom which is further attached to.

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One beta carbon

Two beta carbon

Three beta carbon

Four beta carbon

Vinyl acetylene combines with HCl to form

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Polyacetylene

Benzene

Chloroprene

Divinyl acetylene

Typical transition element is

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Sc

CO

Ra

Y

Which substance is used to convert Grignard reagent to alkane.

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H2O

NH3

Ethyl alcohol

All of these

For which mechanisms, the first step involved is the same

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E₁and E₂

E₂and SN₂

E₁and E₂

E₁and SN₁

SN₂reactions can be best carried out with

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primary alkyl halides

secondary alkyl halides

tertiary alkyl halides

All the three

The conversion of benzene to chlorobenzene is a

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Addition reaction

Elimination reaction

Substitution reaction

Dehydration process