Question # 1

The no. of electrons in the valence shell of alkali metals is

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1

2

4

7

Which one of the following will show negligible effect of temperature on its solubility?

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KCI

KNO³

NaNO³

NaCI

Transition elements are:

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all gases

all metals

all non-metals

all metalloids

Which one is not a tetraatomic molecular?

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H2O

H2O2

SO3

BCL3

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

________________ observed that formation of covalent bonds.

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Rutherford

G.N Lewis

Both a and b

Bohar's

Which one is not a property of electrolytic cell?

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It consists of one complete cell

Anode has +ve charge

It converts electrical energy into chemical one

Anode has -ve charge

The solubility of which salt increases in heating?

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Li₂SO₄

Ce₂(SO₄)₃

NaCI

KCI

Mixture has _________ types.

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3

2

1

No types

The solution in which one component is aqueous ____________ solution.

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Aqueous

Binary

All

None

Mendeleev periodic table was based upon the:

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electronic configuration

atomic mass

atomic number

completion of a subshell

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

Water has a maximum density at 4 ^oC

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12 cm^-3

2 g cm^-3

1 g cm^-3

4 gcm^-3

Amont the followign substitution reaction is characteristics of.

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Alkanes

Alkenes

Alkynes

None of these

Number of vitamins in vitamin B complex is.

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10

8

6

12

Which help to keep the bowel functioning property

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Dietary fiber

Vitamins

Lipids

Carbohydrates

In which of the following groups , oxygen is attached on both sides with carbon atoms.

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Ketone group

Ether group

Aldehyde group

Easter group

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

Dilute acids react with carbonates to produce the given products except.

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Salt

Water

Hydrogen

Carbon dioxide

The process of roasting during metallurgy of copper is carried out in a special furnace called.

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Blast furnace

Fire furnace

Bessemer converter

Reverberatory furnace

The % age of carbon in peat is :

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60%

70%

80%

90%

Eggs oils and fats contain vitamin .

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A

B

C

D

Which statement is incorrect about activated complex

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Short lived

Maximum energy

Unstable combination of atoms

Less energy than Ea

The element nickel has isotopes.

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3

2

5

7

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

As compared to pure atomic orbitals the hybrid orbitals have.

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Low energy

High energy

Same energy

None of these

Conduction of electricity through gases under reduced pressure is due to the transportation of.

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positive charge

Negative charge

Both types of charges

None of these

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

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

The velocity of photon is.

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Depends on its source

Equal to square of its amplitude

Depends on its wavelength

Independent of its wavelength

Large value of distribution coefficient K means.

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Component of solute dissolved large in mobile phase

Components of solute do not dissolve in mobile phase

Components of solute remains at original spot

All statements are correct

In zero order reaction, the rate is independent of

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Temperature of reaction

Concentration of reactants

Concentration of products

None of these

The paper at which separation of solute have been taken place is called.

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Retardation factor

Chromatogram

Base line

Solvent front

Which process is used to convert vegetable oil to vegetable ghee.

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Hydrolysis

Oxidation

Esterification

Hydrogenation

Which field produces significant amount of methane in the atmosphere

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paddy field

Cotton field

Can sugar field

Wheat field

Which ion will have the maximum value of heat of hydration.

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Na+

Ca+

Ba+2

Mg+2

Ortho boric acid on strong beating gives.

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Borax

Boron oxide

Metaboric acid

Tetraboric acid

In which compound, oxidation state of sulphur is +6

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H2S

H2SO4

H2SO3

SO3

Point out the element which forms super oxide

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Li

Na

K

C

Formula of chloroform is

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

In which these process are small organic molecules made into macromolecules.

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethene

The hydrolysis of proteins

Boric acid cannot be used

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As antiseptic in medicine

For washing eyes

In soda bottles

For Enamals and Glazes

------------- metal is used in the Thermite process because of its reactivity

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Tron

Copper

Aluminium

Zinc

In water the concentration of dissolved O₂should be

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1-3 ppm

2-4 ppm

4-8 ppm

8-12 ppm