Question # 1

The value of Planck's constant is

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6.63 x 10-34 Js

6.63 x 10-32 Js

6.63 x 10-30 Js

6.63 x 10-28 Js

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

The number of isotopes of carbon are

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1

2

3

5

____________ do not conduct electricity.

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Electrolyte

Non-electrolyte

Both

Nil

Which one metal can be cut with a knife?

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Na

Mg

AI

Ca

Electrolyte is ____________ solid form.

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in

Sometimes in

Never in

Always in

Which one of the following pair has the same mass?

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1 mole of CO and 1 mole of N₂

1 mole of CO and 1 mole of CO₂

1 mole of O₂ and 1 mole of N₂

1 mole of O₂ and 1 mole of CO₂

When a saturated solution is diluted it tuns into:

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supersaturated solution

saturated solution

a concentrated solution

unsaturated solution

The reaction of ionic compound is very ________________ in solution.

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Slow

Fast

Medium

Nil

Which one of the following solution contains more water?

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2M

IM

0.5M

0.25M

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

Dichloromethane reacts with halogens in the presence of diffused sun light and produces

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Carbon tetrachloride

Chloroform

Chloromethane

No reaction

Major portion of ozone layer is foun in.

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Troposphere

Stratosphere

Mesosphere

Thermosphere

How many percentage blister copper is pure?

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95%

75%

98%

100%

Higher concentration of CO causes.

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Fatique

Headache

Both of them

None of them

The branch of chemistry which deals with the study of hydrocarbons and their derivatives is known as.

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Organic chemistry

Inorganic chemistry

Biochemistry

Nuclear chemistry

Froth flotation process is used to concentrate.

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Copper ore

Iron ore

Chromium ore

Aluminum ore

Atmosphere has regions.

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One

Two

Three

Four

Carbon Tetra chloride is used in .

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Fertilizer

Dry cleaning

Metallurgy

Anesthesia

The substance formed during the chemical reaction are called.

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Products

Reactants

Radical

Element

The molecular formula of the first three members of the alkane hydrocarbons are CH_4,C₂H₆ and C₃H₈. What is the molecular formula for the eight alkane member, octane, which is found is petrol?

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C₈H₈

C₈H₁₆

C₈H₁₈

C₈H₂₀

Lewis acid-base concept have the following characteristics except:

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formation of an adduct

Formation of a co-ordinate covalent bound

Donation and acceptance of an electron pair

Donation and acceptance of a proton

Almost forward reaction is complete when value of Kc is

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very high

Very small

Neither large nor very small

No correlation

In H2SO4the oxidation number of 'S' is

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+2

+6

+8

+4

In triclinic unit cell

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All axial lengths are equal

All internals lengths and angles are equal

Both axial lengths and angles are equal

Both axial lengths and angles are unequal

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

Cathode rays cast shadow when an opaque object is placed in their path. This behavior of cathode rays show that.

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They move is straight line

They are negatively charge

They possess momentum

They are energetic

The heat contents of the system of known as.

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Entropy

Enthalpy

Work

Free energy

Which one of the following has the same number of electrons as an alpha particle.

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H

He

H+

Li+

Dilatometer method is useful for the reactions that involve.

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Ionic species

Where reactant absorb U.V. visible or infrared radiations

Small volume changes in solutions

Change in refractive indices

In endothermic reactions, the heat content of the

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Products is more then that of reactants

Reactants is more than that of products

Both a and b

Reactant and products is equal

Solvent extraction is an equilibrium process and it is controlled by.

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Law of mass action

The amount of solvent used

Distribution law

The amount of solute

The electron in a subshell is filled according to formula.

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2n²

2(2l+1)

(2l+1)

None of these

Which of the following compounds is used to make spray, which has fungicidal action.

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BaSO4

Na2CO3

CaO

CaSO4.2H2O

The most reactive Alkyl halide is

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Alkyl Iodide

Alkyl Bromide

Alkyl fluoride

Alkyl Chloride

Mono saccharides contain carbon atoms.

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3 to 6

3 to 7

3 to 9

only six

Elimination Bimolecular reactions involve

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Second order kinetics

First order kinetics

Third order kinetics

Zero order kinetics

Which one is alcohol in the following

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CH₃.CH₂.OH

CH₃.O.CH₃

CH₃COOH

CH₃.CH₂.Br

In unimolecular reactions, the reaction completes in

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_{One step}

Two steps

Three steps

None of these

Co-ordination number of Pt in Pt Cl(NO₂)(NH₃)₄

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2-

4

1

6

NO2 can be obtained by heating.

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NaNO3

KNO3

Pb(NO3)2

NH3NO3

------------------- is not a nucleophile

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H₂O

NO₃

BF₃

NH₃

Which acid is used in the manufacture of synthetic fibre

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

In fluorescent tube, the gas filled is.

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He

Ne

Ar

Xe