Question # 1

Transfer of electrons between atoms results in:

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metallic bonding

ionic bonding

covalent bonding

coordinate covalent bonding

105 elements were discovered by the year ________________

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1984

1974

1086

1996

P1V1 = P2V2 is mathematical form of ____________ law.

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Bohr's

Charles

Boyle's

Nil

CO2 the oxidation number of C =.

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+1

+2

+3

+4

The period of Alchemists extends from _________ AD.

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800 to 1800

600 to 1600

900 to 1900

700 to 1700

In volvox asexual cell produced:

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Daughter colonies

Sperm

Egg

All

Water is a ____________ covalent compound .

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Polar

Non polar

Ionic

Nil

Silver is a ____________ metal.

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Pure

Noble

None

All

Elements are represented by chemical _________

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Abbreviation

Unit

Symbols

It can be represented

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

The core of the earth is ____________ than crust.

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LIghter

Heavier

Both

Nil

The green house effect is proportional to the amount of which gas in air.

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CO₂

O₂

N₂

All of them

pH of neutral solution is always.

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6

5

7

10

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

____________ is synthetic fiber.

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Cotton

Woal

Nylon

Silk

The general formula of alkane is

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C_nH_2n+2

C_nH_2n-2

C_nH_2n

C_nH_2n+1

Bases gave taste:

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Bitter

Sweetsh

Sour

Saltish

The organic compound used as drugs to control bleeding are.

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Vitamins

Proteins

Lipids

Glycerides

Atmosphere is divided into;

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3 regions

4 regions

5 regions

6 regions

The strone heating of coal in retorts in the absence of air is called.

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Fractional distillation

sublimation

Roasting

Destructive distillation

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

Chalco-Pyrite is an ore of:

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Copper

Silver

Iron

Aluminium

Chromatography involves the distribution of a solute between.

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Two stationary phases

Two mobile phases

A stationary phase and a mobile phase

Two stationary and two mobile phase.

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

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O₂⁺²

N₂^-2

B₂

F₂

Which has greater enthalpy of vaporization

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F2

Cl2

Br2

I2

Diamond is a bad conductor of electricity because

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It has a tight structure

It has a high density

There are no free electrons present in the crystal of diamond to conduct electronics

None of these

If uncertainty position of an electron is zero, the uncertainty in its momentum would be

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Zero

Infinite

Both a and b

None of these

What is the oxidation state of sulphur in SO3^2-

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-4

-2

+2

+4

Paalladium has isotopes.

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6

₇

8

9

Which solution is an example of solid in gas

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Fog

Steel

smoke

Air

The value of Rydberg constant is.

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1.6 x 10⁷ m-1

1.9768 x 10⁷ m-1

1.09678 x 10⁷ m-1

1.7904 x 10⁷ m-1

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

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Chlorine

Argon

Phosphorus

Silicon

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideal behaviour of gases

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At high pressure, the gas molecules move in one direction only

At high pressure, the collisions between the gas molecules are increased

At high pressure, the volume of the gas becomes insignificant

At high pressure, the intermolecular attraction becomes significant

The composition mixture of clay and lime stone in the raw material.

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75% lime stone and 25% clay

25% lime stone and 75% clay

15% lime stone and 55% clay

55% lime stone and 15% clay

Which halogen occurs naturally in a positive oxidation state

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Fluorine

Chlorine

Bromine

Iodine

A quality of raw water is improved by

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Reduction

Aeration

Dehydration

Incineration

Laughing gas is chemically

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NO

NO₂

N₂O

N₄O₄

Which is the second most abundant element in the universe

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H

He

CO

C

The temperature of digester is main tained at

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100^oC

160-180^oC

200^oC

200-240^oC

Which one is metaphosphoric acid

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HPO3

H3PO3

H3PO4

H4P2O7

Cyclic structure of benzene was proposed by

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Dewar

Faraday

Down

Kekule

Which of the following gives acidic oxide

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N

As

Sb

Bi

Mild steel contains carbon percentage

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0.1 - 0.2%

0.3 - 0.7%

0.7 - 1.5%

1.6 - 2.0%

Which one of the following is a condensation polymer

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Polystyrene

Polyester

Polyethene

Nylon 6,6