Question # 1

________________ observed that formation of covalent bonds.

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Rutherford

G.N Lewis

Both a and b

Bohar's

Which one of the following shell consists of three subshells?

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K- shell

M-Shell

L-shell

M-shell

The fundamental unit of elements is ___________

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Molecule

Atom

Matter

Mixture

Tyndall effect is shown by:

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sugar solution

paints

jelly

chalk solution

The most common example of corrosion is:

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Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

Films are coated by special chemical known as ____________ detectors.

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Photographic

Image

Nil

Both

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

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Hydrogen

Nitrogen

Sulphur

Phosphorus

Which one of the following is not amorphous?

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rubber

plastic

glass

glucose

The maximum no.of electrons that can be accommodated in M shell are

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2

8

18

32

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

Earth has natural systems.

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One

Two

Three

Four

Lavoisier named binary compounds of oxygen acids in .

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1787

1790

1815

1828

Raw materials used in Solvay's process.

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Brine

Lime stone

Ammonia gas

All

The Earth's atmosphere is getting hotter because of.

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Increasing concentration of CO

Increasing concentration of CO₂

Increasing concentration of O₃

Increasing concentration of SO₂

Which is the major effect of global warming?

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Increase in temperature.

Rise in sea level

Melting of glaciers

All of them

Which of the following is tasteless?

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Starch

glucose

Fructose

Sucrose

Boiling point of water is:

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0^oC

25^oC

80^oC

100^oC

Wood contain the amount of carbon.

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70%

80%

60%

40%

Dilute acid react with carbonates the produce product except _________

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Salt

Water

Carbon di oxide

Hydrogen gases

Depending upon temperature variation, atmosphere ins divided into how many regions?

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1

2

3

4

The acid which is called king of chemicals.

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Sulphuric Acid

Nitric Acid

Hydrochloric acid

Acetic acid

The molarity of 2% w/v NaOH solution is

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2

0.25

0.05

0.5

Lyman series lie in

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Ultraviolet region

Visible region

Infrared region

Radio waves region

In mass spectrometry, ions are produced by

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Heat at high temperature

Passing gas through high voltage plates

Throwing fast moving electrons on gas molecules

All of them

Hund's rule state that when electrons enter to the same sub levels they are.

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Singly occupied with same spin

Doubly occupy with same spin

Singly occupied with different spin

Doubly occupied with different spin

Which particle have greater wave nature.

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Electron

Proton

Neutron

a particles

How should the condition be changed to prevent the volume of a given gas from expanding when its mass is increased

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Temperature is lowered and pressure is increased

Temperature is increase and pressure is lowered

Temperature and pressure both are lowered

Temperature and pressure both are increased

Equal masses of methane and oxygen are mixed in an empty container at 25°C, the fraction of total pressure exerted by oxygen is

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1/3

8/9

1/9

16/17

When a chemical reaction is completed.

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

Chromatography is the process which involve the distribution of a solute between

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Two mobile phases

A stationary phase and mobile phase

Two stationary and two mobile phases

Two stationary phases

Which statement is correct about solubility product constant.

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It is applicable at highly soluble substances.

Value of Kap is independent of temperature

It is used for homogeneous aquarium system

It can be used to predict that precipitation will take place or not by combining two ions

Which property of triglycerides is used to determine its molecular mass.

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acid number

Saponification number

Iodine number

gold number

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

The total number of transition element is

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10

14

40

58

Which halogen will react spontaneously with Au_(s)to produce Au³⁺

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Br₂

F₂

I₂

Cl₂

Methyl alcohol is not used

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As a solvent

As an anti freezing agent

As a substitute for petrol

For denaturing of ethyl alcohol

A cyanohydrin is formed by the reaction of

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Alcohol and HCN

Ketone and NH3

Aldehyde and NH2OH

Aldehyde and HCN

Which is not used of Borax

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Softening of water

As medicine for washing eyes

As flux in metallurgical operations

To make quartz

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

The carbon atom of a carbonyl group is

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sp hybridized

sp²hybridized

sp³hybridized

none of these

Vinyl acetylene combines with HCl to form

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Polyacetylene

Benzene

Chloroprene

Divinyl acetylene

Which compound is more soluble of water

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C2H5OH

C6H5OH

CH3OCH3

n- Hexanol