Question # 1

Mist is an example of solution:

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liquid in gas

gas in liquid

solid gas

gas in solid

The earth is made up of ___________ % of iron.

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4

5

6

7

A two component solution is called ____________ solutions.

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Binary

Once

Both

None

Modern periodic table can be classified into ________________.

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Elements

s, p, d, f blocks

Periods

ROWS

An ________________ scientist arranged the elements in order in periodic table.

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English

Italian

African

Indian

Which one of the following shell consists of three subshells?

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K- shell

M-Shell

L-shell

M-shell

The bond between two atoms will be ionic if the difference between their electronegativities is:

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Less than 1.7

Greater than 1.7

Zero

Less than 1.2

________________ is triangular in shape.

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BCL3

H2O

CO2

NH3

Identify when pair has polar covalent bonds:

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O₂ and Cl₂

H₂O and N₂

H₂O and C₂H₂

H₂O and HCI

Diamonds exists in ____________ form.

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Cubic

Linear

Circular

Nil

There are _________ elements found till now .

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120

118

119

117

The major constituents of troposphere are:

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carbon dioxide and argon

nitrogen and oxygen

argon and oxygen

carbon dioxide and oxygen

Which one of the following is manufactured by Solvar's process:

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caustic soda

washing soda

urea

sulphuric acid

Which one is the formula of chloromethane.

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CH₂Cl₂

CCl₄

CHCl₃

CH₃Cl

The colour of litmus in a strong basic solution become.

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Yellow

Blue

Red

Colourless

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

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Carbonat salt

Sulphonic acid

Sulphat salt

Phosphate salt

Dehalogenation of tetrahalides produces acetylene. This reaction takes place in the presence of

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Sodium metal

Zinc metal

Magnesium metal

Potassium metal

Chemical formula of chloroform is :

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CH₂Cl₂

CH₃Cl

CHCl₃

CCl₄

The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water.

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Nitrogen

Hydrogen

Oxygen

Carbon

When CaCO_3,.is heated in an open flask, it decomposes to form calcium oxides and .

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O₂

CO

CO₂

CO₃

If an organic compound has 4 carbon atoms, all singly bonded, it will have the following characteristics except one.

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It will be saturated hydrocarbon

It will hav 8 hydrogen atoms

Its name will be n-butane.

It will be least reactive.

Chemical form of gypsum.

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MgSO₄. 5H₂O

CaSO₄. 2H₂O

FeSO₄. 5H₂O

CuSO₄. 5H₂O

Buffer action can be explained by

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Common ion effect

Law of mass action

Le Chateller's principle

All above

Which of the following wave properties is inversely proportional to the energy for electromagnetic radiations

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Frequency

Wave number

Velocity

Wave length

The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is known as

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Henry's law

Hess's law

Joule's principle

Law of conservation of energy

In the ground state of an atom the electron is present.

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In the nuclsus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

Cathode rays strike alumina and produce a ..........colour.

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Red

Blue

Yellow

Green

Which solution is an example of solid in gas

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Fog

Steel

smoke

Air

Colligative properties are the properties of.

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Dilute solution which behave as nearly ideal solutions

Concentrated solutions which behave as nearly non ideal solutions

Both a and b

Neither a nor b

Upper consulate temperature for water phenol system is.

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150 ^oC

65.9 ^oC

120 ^oC

130 ^oC

The molal boiling point constant is the ration of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

Which statement is incorrect about Dempster's mass spectrometer.

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Solid sample can be used in this mass spectrometer

Ions are detected on the basis of mass to charge ratio

Atoms or molecules are ionized with beam of electron.

This spectrometer work at one atmospheric pressure.

If 2 mol of an ideal gas at 546 K occupy a volume of 44.8 dm3, the pressure must be.

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1 atm

2 atm

3 atm

4 atm

Which one of the following will be required to form ethene from ethyl chloride.

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Alcoholic KOH

Aqueous KOH

Alkaline KMnO4

Bromine

Oxides of alkaline earth metal are

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Acidic

Basic

Neutral

Amphoteric

The reaction of alkyl halides with sodium metal in the presence of ether to from alkane is known as.

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Wortz reaction

Frankland reaction

Sabatier sendron

Kolbe's synthesis

Aromatic compounds burns with sooty flame because.

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They have high percentage of hydrogen

The have a right structure

The have high percentage of carbon

The resist reaction with air

___________ is use as a cooling medium for nuclear reactors

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Ne

He

Ar

Kr

The substance that retard the activity of enzyme is called.

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Co enzyme

Epo enzyme

Activity

Substrate

Formalin is a 40% solution of

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CH₃CHO

CH₃OH

HCHO

CH₃OCH

Which one of the following can best be used to distinguish between samples of ethane and ethene

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Aqueous BaCl2

Aqueous bromine

Lime water

Litmus solution

Amongst the following, the compound that can be most readily sulphonated is

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toluene

benzene

nitrobenzene

chlorobenzene

What are the total numbers of periods in the modern periodic table

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3

5

7

8

Tincal is a mineral of

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Al

C

Si

B