Question # 1

Which has biger particles?

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Solutions

Colloids

Suspensions

True solutions

The number of proton in an atom is called _________ number.

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Molecule

Formula

Atomic

Molar

The concept of orbit was used by:

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J.J Thomson

Rutherford

Bohr

Planck

The reaction of ionic compound is very ________________ in solution.

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Slow

Fast

Medium

Nil

An ion is a charged particles:

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True

False

In some conditions

Never

Fog is an example of ____________ in gas.

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Solid

Liquid

Gas

Plasma

In metal hydrides, the oxidation number of hydrogen is

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+1

-1

+2

-2

Which one of the following does not affect the boiling point?

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intermolecular forces

external pressure

nature of liquid

initial temperature of liquid

The bound between ionic compound is ............ .

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Covalent

Co-ordinate

Ionic

Nil

Which one of the following will not react with dilute HCI?

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Sodium

Potassium

Calcium

Carbon

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

The strong heating of coal in retoris in the absence of air is called.

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Fractional distillation

Sublimation

Roasting

Destructive distillation

Composition of carbon in kerosene oil is.

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C₁₀-C₁₂

C₁₂-C₁₂

C₁₆-C₁₈

C₃₀-C₃₀

Which one of the following is used as jet fuel.

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Kerosene oil

Lubricating oil

Fuel oil

Diesel oil

Rapid growth of algae in water bodies is because of detergent having.

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Carbonate salts.

Sulphonic acid salts.

Sulphate salts.

Phosphate salts.

Molecular formula of butane is

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C₄H₈

C₄H₁₀

C₄H₁₂

C₄H₆

DNA was discovered by

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J .Watson

Funk

Robert brown

Hopkins

The 1st organic compound prepared in laboratory.

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Urea

NaCl

Thiourea

Pyridine

Mesosphere has a temperature range.

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17 ^oC - 58^oC

58^oC - 2^oC

2^oC - 93^oC

- 93^oC

The percentage of SO₂released by the combustion of coal and petroleum product.

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40%

60%

70%

80%

Glucose and fructose are;

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trioses

tetroses

pentoses

hexoses

Which factor determines the severity of a pollutant?

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Chemical nature

concentration

Persistence

All of them

If fluted fitter paper, rate of filtration increases as compared tot he cone shaped filter paper because.

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It has greater number of holes in it.

It has greater surface are of filtration

Fluted filter paper has greater pore sizes than cone shaped filter paper.

Thickness of paper is more than cone shaped filter paper

The charge on electron was determined by millikan in his oil drop experiment and its value is

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6.023 x 10^-23C

1.602 x 10^-23C

1.602 x 10^-19C

6.625 x 10^-34C

Colligative properites are the properties of

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Dilute solutions which behave as nearly ideal solution

Concentrated solution which behave as nearly non-ideal solution

Both a and b

Neither a nor b

The heat contents of the system of known as.

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Entropy

Enthalpy

Work

Free energy

Oxidation number of carbon in NaHCO₃

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+4

-6

+6

+2

The rate of reaction

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Increases

Decreases

Remains the same

May decrease of increase

Some impurities of MgCl2 are present in NaCl which separation technique can be used to separate the impurities.

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Filtration

Crystallization

Common ion effect

Chromatography

Relative lowering of vapour pressure is equal to.

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Mole fraction of solute

Mole fraction of solvent

Mole fraction of solute and solvent

Molality of solution

Melting of ice can be forwarded by the use of.

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LiCl

BeCl2

NaCl

Ag Cl

Which of the following species has unpaired electrons in anti-bonding 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

Which substance is used for denaturing of ethanol

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Methanol

Acetone

Pyridine

All

Which one is used as debydrating agent for alcohol.

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H2SO4

Al2O3

H3PO4

All of these

In ethene molecule, the number of atoms which are present in the same plane are.

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2

6

3

4

The reaction between concentrated H2SO4 and glucose give carbon and water. In this reaction H2SO4 acts as.

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An acid

An oxidising agent

Dehydrating agent

A reducing agent

The composition of oleum is.

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H2SO4

H2S2O3

H2S2O7

H2S3O7

For which mechanisms, the first step involved is the same.

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E2 and E2

E2 and SN2

SN1 and E2

E1 and SN1

In which substance phosphorus is not present.

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Yolk of egg

Bones

Apatite

Galena

Element of which group reacts with hydrogen and form ionic hydrides.

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II A

IV A

V A

VI A

Which catalyst is used Friedel Crafts reactions

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AlCl₃

BeCl₂

NaCl

HNO₃

Acetylene reacts with ammoniacal cuprous chloride a red ppt is formed. This red ppt is of

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Copper chlorite

Coper chlorate

Cupric oxide

Copper acetylide

Ecosystem is smaller units of.

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Lithosphere

Hydrosphere

Atmosphere

Biosphere