Question # 1

Number of electronsin nitrogen molecule is.

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2

4

6

8

A covalent bond formed by two similar stoms is known as.

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Polar Covalent bond

Metallic bond

Double covalent bond

Non-polar covalent bond

Identify the covalent compund

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NaCl

H₂O

KF

MgO

17th Group of elements contain electrons in their outer most shell

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4

5

7

6

When NaOH and HCl are mixed the temperature increases. The reaction

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Exothermic with a negative enthalpy chagne.

Endothermic with a positive enthaly change.

Endothermic with a negatie enthalpy change

Exothermic with a positive enthealpy change

The electropositive elements have the tendency to

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Lose electrons

Gain electrons

Share electrons

All of these

A covalent bond formed by the mutual sharing of two pairs of electrons between bonded atoms is called.

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Signle covalent bond

Double covalent bond

Triple covalent bond

Polar covalent bond

Covalent Bond involves the

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Sharing of electrons

Repulsion of electrons

Acceptance of electrons

Donation of electrons

With the increase of atomic numebr , the number of electron in an atom also.

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Decreases

First increases then decreases

Increases

None of the above

None polar compounds are insoluble in

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Alcohol

Benzene

Ether

Water

Atoms achieve stability by attainign electonic configuration of.

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Alkali metals

Coinage metals

Inert Gases

Alkaline earth metals

The pH of water containing CO₂ is

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4-6

5.6-6

6-7

7-8

Formic acid is present in

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String of bees

Sour milk

Apple

Fats

Swimming pools are cleaned by a process:

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Hydrogenation

Bromination

Chlorination

Nitration

Chemical formula of matte will:

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Cu2S.FeS

Cu2S

Cu2O

FeS

Which is used to manufacture of soap?

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NaOH

Ca(OH)₂

KOH

Mg(OH)₂

Citric acid is present in

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Citrus fruits

Sour milk

Rancid butter

Apple

The value of K_c depends on.

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Temperature

Pressure

Volume

Atmosphere

Atmosphere has regions.

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One

Two

Three

Four

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

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40%

60%

70%

80%

Coal gas is mixture of

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CO and CH₄

CO . CH₄. CO₂

CO, CH₄, H₂

CO, H₂ and CO₂

K_c is always equal to

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Rf/Rr

Kf /Kt

Kf/Kr

Rr/Rt

Partial pressure of oxygen in the air is.

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156 torr

157 torr

158 torr

159 torr

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

The number of bonds in oxygen molecules.

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One sigma and One pi

One sigma and two Pi

Three sigma only

Two sig and two pi

The true representation for the units of rate constant K for the first order reaction

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sec^-1

mole dm^-3s

mole dm^-3s^-1

mole^-1dm⁺³s^-1

The deviation of a gas from ideal behavior is maximum at.

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-10 ^oC and 5.0 atm

-10^oC and 2 atm

0^oC and 2 atm

100^oC and 2 atm

The comparative rates at which the solutes move in paper chromatography, depends on

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The size of paper used

Their R_fvalues

Their partition coefficients

The polarity of solvent used

De Broglie equation treats electron to be.

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A particle

Wave

Both particle and wave

None of these

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

That cell in which electrical energy is converted into chemical energy is called

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Galvanic cell

Electrolytic cell

Fuel cell

Daniel cell

When small amount of acid or base is added to buffer, its pH.

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Remain same

Always increases

Always decreases

slightly increases or decreases

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

Ammonium nitrate fertilizers is not used for which crop

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Cotton

Wheat

Sugar cane

Paddy rice

Which element reacts with carbon to form metal carbide.

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Li

Na

K

All of these

Phosphorous helps the growth of

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root

leave

stem

seed

Which of the following is not a fatty acid

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Propanoic acid

Acetic acid

Phthalic acid

Butanoic acid

Formation of cyanohydrin from an aldehyde in an example of.

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Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

Which metal is redered passive by HNO₃due to formation of a film of metal oxide over the metal

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Pt

Sn

CO

Mn

Group VI-B of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

Which one of the following methods is used for the preparation of ether.

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Kolbe's reaction

Frankland reaction

Williamson synthesis

Down's process

Whcih water will be considered as polluted water.

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High value of COD

Low value of COD

High value of DO

Low value of BOD

Bakelite is obtained from phenol by reacting with

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Acetal

Ethanal

Formaldehyde

Methanol

Aluminium oxide is

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Acidic oxide

Baric oxide

Amphoteric oxide

None of these