Question # 1

___________ is a pure substance that can be broken down.

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Matter

Element

Mass

Mixture

The most common example of corrosion is:

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Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

How many number of electrons take part in triple covalent bond?

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2

4

6

8

____________ are good conductors of electricity.

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Covalent compound

Metals

Both

None of these

The period of Alchemists extends from _________ AD.

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800 to 1800

600 to 1600

900 to 1900

700 to 1700

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

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Smaller

Larger

Medium

Nil

The types of solutions on the basis of their physical states are

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3

6

9

12

____________ do not conduct electricity.

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Electrolyte

Non-electrolyte

Both

Nil

Metals are covered by using.

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Baeyer's test

Bohr's

Electrolysis

None

Which one of the following gas diffuses faster?

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hydrogen

helium

fluorine

chlorine

In ionic bond complete ________________ of electrons occurs.

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Paring

Sharing

Transfer

None

How many % age of urea is used as fertilizers?

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80%

90%

95%

98%

According to Bronsted and Lowry concept a base is a substance that can accept.

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Proton

Electron pair

Neutron

Electron

On which base atmosphere is divided into four regions?

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Change in pressure

Change in rediation

Change in temperature

Change in volume

By the increase in the concentration of CO₂ in air.

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Decrease in heat energy

Increase in heat energy.

Heat energy remains same

None of them

Which one of these is a saturated hydrocarbon?

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C₂H₄

C₃H₆

C₄H₈

C₅H₁₂

Which gas is not present in atmosphere?

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Nitrogen

Oxygen

Helium

Carbon dioxide

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

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Carbonterachloride

Chloroform

Carbon Black

Chloromethane

Thermosphere lies beyond.

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Stratosphere

Troposphere

Mesosphere

Biosphere

Number of discovered element till today are.

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140

118

90

16

Maltose is commonly found in .

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Cereal

Milk

Cotton

Honey

General formula of alkenes.

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C_n H_2n-2

C_nH_2n

C_nH_2n+2

C_nH_2n-1

Which one of the following aqueous solutions has the highest pH

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0.1 M NaOH

0.1 M HCl

0.2 M H2SO4

0.1 M HNO3

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

In NICAD dry cell, the cathode and anode is made up of.

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Ca and Ag

Ni and CdO2

NiO2 and Cd

Ag and Ag2O

Half life period for 235 U is

92

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710 million years

810 milion years

720 million years

820 million years

The rate of reaction determined at any given time is called.

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Average rate

Instantaneous rate

Spontaneous rate

Over all rate

Fuel cells are the means by which chemical energy may be converted into

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Heat energy

Magnetic energy

Sound energy

Electric energy

the number of Al³⁺ ion sin AlCl₃is 2.007 x 10²³. The number of Cl- ions are.

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6.02 x 10²³

3.01 x 10²³

1.5 x 10²³

The number of bonds in nitrogen molecules is.

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One pi and one sigma

One pi and two sigma

Thre sigma only

Two pi and one sigma

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

Total pressure of mixture of two gases is.

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The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

Safe and reliable method of drying crystals is through.

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Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

Which one of the following compounds is not derivative of NH3.

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Aniline

Hydrazine

Phenyl hydrazine

Picric acid

Which compound is least reactive

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CH3-CH3

CH2=CH2

CH=CH

C6H6

Which substance is water repellant and used in ceramic insulators.

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Asbestos

Lead compounds

Silicon carbide

silicones

Grignard reagent is reactive due to

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The presence of halogen atom

The presence of Mg atom

The polarity of C -Mg bond

None of the above

During pulp making, the pH of digester is maintained at.

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1-2

3-5

6-8

7-9

Which is not a calcarious material

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Clay

Limestone

Marble

Chalk

Which alkyne reacts with water and form aldehyde

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Ethyne

Propyne

1- Butyne

2- Butyne

Which one of following is used in cosmetics

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Talc

Asbestos

Sodium sulphate

Aluminium Sulphate

Hydrogen resembles in properties with

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IA, IV A and VII A elements

III A, IV A and V A elements

II A, IV A and VI A elements

II A, III A and VII A elements

Plastics are pollution problem because many plastics

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are made from petroleum

are very inflammable

burn to produce toxic fumes

decompose to produce toxic products

Micro-nutrient is required in quantity for plant growth ranging from

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4-40 gm

6-200 gm

6-200 kg

4-40 kg