Question # 1

The third abundant as found in the earth' crust is:

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Carbon monoxide

Oxygen

Nitrogen

Argon

H° + H° are ________________ in energy.

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Lower

Higher

Medium

Nil

The reaction of ionic compound is very ________________ in solution.

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Slow

Fast

Medium

Nil

CO2 the oxidation number of C =.

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+1

+2

+3

+4

A heterogeneous mixture of different substance are called:

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Solution

Suspension

Colloids

Nil

Tyndall effect is shown by:

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sugar solution

paints

jelly

chalk solution

The equation of relationship between atomic number (Z) and mass number (A) is

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A = Z + N

A = Z - n

A = Z

A =2Z + n

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

Metals from a ____________ part of earth on which we live.

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Smaller

Larger

Medium

Nil

The 2nd and third periods are called

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short period

Normal period

Long period

Very long period

Sodium is exterminate reactive metal, but it does not react with:

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Hydrogen

Nitrogen

Sulphur

Phosphorus

Bronsted and Lowry presented their theories of acids and bases in

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1785

1787

1923

1925

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

Acid rain affects the aquatic life by clogging fish gills because of:

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Lead metal

Chromium metal

Mercury metal

Aluminium metal

|Which one is not an Arrhenius acid?

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HCl

H2SO₄

CO₂

HNO₃

General formula of Alkyl radical is..

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C₆H_2n-2

C_nH_2n+2

C₁₁H_2n-1

C_nH_2n-2

At dynamic equilibrium state:

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Rate of forward reaction≠ Rate of reverse reaction

Rate of forward reaction > Rate of reverse reaction

Rate of forward reaction = Rate of reverse reaction

Rate of forward reaction < rate of reverse reaction

Which helps in lowering of cholesterol level?

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Vitamin

Fiber

Carbohydratres

All of them

Photosynthesis process produce.

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Carbondioxide

Glucose and oxygen

Carbon di oxide

glucose and carbondoxide

Which hydrocarbon decolorizes the pink colour of acidic solution of potassium permanganate?

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CH₄

C₂H₄

C₂H₆

C₂H₅

Process of heating the concentrated ore to high temperature in excess of air is called.

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Roasting

Smelting

Bessemerization

All

Halogenation of methane produces following valuable chemical compounds used as solvents except.

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Carbonterachloride

Chloroform

Carbon Black

Chloromethane

In paper chromatograghy the point at which the solvent rises to maximum extent is called

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Event

Chromatogram

Solvent front

Base line

Which of the following orbitals is not possible.

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3p

4s

2d

Is

Which of the following can form H-bonds

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NH₃

C₂H₆

NaCI

CHCI₃

Depression of freezing point method is used for determination of molar masses of

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Electrolytes

Non-volatile solids

Volatile solids

Volatile liquids

Rate of diffusion of CO and N₂are same at room temperature due to the reason, that

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Both are diatomic molecules

Both have same multiple bond in them

Both have lone pairs in them

Both have same molar masses

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

Stronger the oxidizing agent greater is the

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Oxidation potential

Reduction potential

Redox potential

E.M.F of cell

The reduction potential of Zn is.

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+0.76 V

-0.34 B

+0.34 V

-0.76 V

Which of the following species has unpaired electrons in antibonding molecular orbitals.

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O2⁺²

N2^-2

B2

F2

Glucose can be converted into ethanol by an enzyme.

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Lipase

Zymase

Sucrose

Urease

The real gas obeying Van der Waal's equation will resemble ideal gas is.

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both 'a' and 'b' are large

both 'a' and 'b' and small

'a' is small and 'b' is large

'a' is large and 'b' is small

Which is an aromatic compound

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Anthracene

Naphthalene

Toluene

All of the these

Formation of cyanohydrin from an aldehyde in an example of.

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Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Which of the following derivative connot be prepared directly from acetic acid.

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Acetamide

Acetyl chloride

Acetic anhydride

Ethyl acetate

Which one of the following group of Periodic table called chalcogen family.

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Group III A

Group VA

Group VI A

Group VII A

Which compound is formed, when CH₃OH reach with CH₃- Mg -Br

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Ethane

Methane

Ethanol

Acetone

Biphenyl is

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Monocyclic aromatic compound

Polyclic aromatic compound

Polycyclic fused ring compound

Alicyclic compound

The strength of binding energy of transition elements depends upon

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number of electron pairs

number of unpaired electron pairs

number of neutrons

number of protons

Group VI B to transition elements contains

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Zn, Cd, Hg

Fe, Ru, OS

Cr, MO, W

Mn, Te, Re

Benzene cannot undergo

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Substitution reactions

addition reactions

oxidation reactions

elimination reactions

Total number of d-block elements are

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10

20

30

40