Question # 1

The smallest under of an ionic compound is

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Atom

Formula unit

Ion

Molecule

The earth is made up of ____________ % of aluminum.

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6

7

8

9

Which is used for industrial manufacture of NaCI?

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Daniel cell

Down's cell

Nelson's cell

None of these

A heterogeneous mixture of different substance are called:

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Solution

Suspension

Colloids

Nil

Every system in the universe tends to lower its energy to attain ________________

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Freedom

Flow

Stability

Nil

Half life of C-14 ________________ years.

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5800

5700

5600

5500

The earth is made up of ___________ % of calcium.

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4

5

6

7

In diamonds, carbon are ____________ bonded.

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Tetrahedrally

Single

Double

None

The atomic number is represented by ____________

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A

Y

X

Z

_________ elements naturally occurring.

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92

118

93

117

Modern periodic table can be classified into ________________.

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Elements

s, p, d, f blocks

Periods

ROWS

Normal rain water is:

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weakly acidic

strongly acidic

weakly basic

strongly basic

Water dissolves Non-ionic compounds by:

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Ion-Ion forces

Dipole forces

Dipole - Dipole forces

Hydrogen Bonding

Which one of the following is crystalline solid.

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Glucose

Starch

Cellulose

Glycogen

The source of galactose.

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Fruits

Vegetables

Cereals

All of them

Natural gas contains.

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Methane

Ethane

Propane

All

Some organic compound are soluble in water due to the presence of .

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-OH

H⁺

Botha a and b

Covalent bond

Chemical formula of matte will:

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Cu2S.FeS

Cu2S

Cu2O

FeS

Concentration of the copper ore is carried out by:

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Calcinations

Roasting

Forth flotation

Distillation

General formula of alkenes.

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C_n H_2n-2

C_nH_2n

C_nH_2n+2

C_nH_2n-1

Ionic compounds are soluble in water due to:

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Hydrogen bonding

ion-dipole forces

Dipole-dipole forces

Dipole -induced dipole forces

General formula of carbohydrate is.

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C_n(H₂O)₆

CH

C_nH_2n

C₆H_2nO

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

Oxidation number of phosphorus in the compound is.

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+3

+4

+5

+6

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

When fast neutron carries nuclear reaction with nitrogen it ejects aprticles.

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Alpha

Gamma

Beta

Nil

A real gas can be liquefied if.

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Temperature is more than critical temperature.

Temperature is less than critical temperature

Pressure is more than critical pressure and temperature is less than critical temperature

Its pressure is less than critical pressure

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

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CH2

C2H4

C3H6

C4H8

The born Haber cycle is the best application of law.

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Boyle's

Dalton's

Hess's

Graham's

The boiling point of water at the top mount Everest is.

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59^oC

69^oC

83^oC

75^oC

Carbon atom in methane in hybridized.

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sp3

Sp2

Sp

dsp3

The molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

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

Which chemicals used for detection of amino acids.

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NaOH + I2

Phenyl hydrazine

Ninhydrin

Benedict's solution

Ammonium Nitrate fertilizer is not useful for

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Wheat

Cotton

Sugan cane

Paddyrice

The presence of a double bond in a compound is the sign of.

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Saturation

Unsaturation

Substitution

None of these

Effect of substituent on benzene ring is due to

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Resonance

Inductive effect

Both a and b

Neither a nor b

Dolomite is a carbonate of

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Be

Mg

Na

Ba

Which element when react with chlorine form polymeric halide.

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Na

Be

Ba

P

The nitrogen present in some fertilizers helps plants

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to fight against diseases

to produce fat

to undergo photosynthesis

to produce protien

The resonating contributing structures of Benzene are

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2

3

5

7

Which one of the following oxides is amphoteric in nature.

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MgO

Na2O

SO2

ZnO

Which one of the following molecules does not form alcohol when reacts with a Grignard reagent.

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Formaldehyde

Acetaldehyde

Propanone

CO2

Which one of the following elements burns in air to form an oxide which, when shaken with water, give a solution with a pH greater than 7.

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Carbon

Magnesium

sulphur

Hydrogen