Question # 1

An atom having six electrons in its achieve noble electronic configuration by:

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gaining one electron

losing all electrons

gaining two electrons

losing two electrons

The smallest under of an ionic compound is

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Atom

Formula unit

Ion

Molecule

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

The number of isotopes of carbon are

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1

2

3

5

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

Intermolecular forces are of three types and are collectively called ____________

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Nelson' forces

Vander Waal's forces

Neurons

Nil

All metals are solid except

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AI

Mg

Na

Hg

________________ are formed from chemical reactions.

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Elements

Mixture

Substance

Nil

In double covalent bond, every atom provides

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1 electrons

2 electrons

4 electrons

6 electrons

Bucky Balls are used as ________________

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Cutting

Grafting

Lubricants

Nil

T (K) =

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(T) °C + 273

(T) °C -273

(T) °C + 373

(T) °C -373

Guldberg and waage put forward law of mass action in:

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1860

1869

1870

1879

Which of following is not conjugate base.

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S^-2

F^-1

Na⁺

SO₄

The accumulation of which vitamin causes bone like deposits in the kidney.

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Vitamin D

Vitamin E

Vitamin B

Vitamin A

The end product of oxidation of acetylene is .

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Oxalic acid

Glyoxal

Glycol

None of these

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

Which acid is found in sour milk?

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`Formic acid

Lacitc acid

Citric acid

Butric acid

Sodium zeolite is resin of:

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NaAl(SiO₃)₂

KAl(SiO₃)₂

LiAl(SiO₃)₂

RbAl(SiO₃)₂

Sea water in unfit for drinking purpose die to the presence of.

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Salts

Algae

Fishes

All of them

Binary compounds of oxygen such as CO2 and SO2 were names as acids by;

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Jabir Bin Hayan

Lavoisier

Al- Jahiz

Sir Humphrey Davy

Which gas is used to destroy harmful bacteria in water?

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Iodine

Chlorine

Flourine

Bromine

Benzene is formed by the polymerization of.

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Alkene

Alkane

Acetylene

Methane.

The value of pH and P^oHof pure water at 25° C is

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14

7

1 x 10^-14

1 x 10¹⁴

Which process is endothermic and spontaneous

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Neutralization of NaOH with HCl

Formation of NH3 from H2 and N2

Formation of H2O from H2 and O2

Evaporation of sea water

In a solution 7.8 g of benzene and 46 g of toluene is present The mole fraction of benzene is.

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1/2

1/3

1/5

1/6

the order of the rate of diffusion of gases NH₃, SO₂, CI₂and CO₂is

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NH₃> SO₂>CI₂CO₂

NH₃> CO₂> SO₂> CI₂

CI₂> SO₂> CO₂> NH₃

NH₃> CO₂> CI₂> SO₂

Which particle has a mass 1/1836 time, that of hydrogen.

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Proton

Positron

Electron

Neutron

In case of non volatile solute, lowering of vapour pressure is proportional to.

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Mass fraction of solute

Mole fraction of solvent

Mole fraction of solute

None of the above

X- rays have same nature as

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Alpha rays

Beta rays

Gamma rays

Cathods rays

How many allotropic forms are present in carbon

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Two

Three

Four

Five

Many element have fractional atomic masses. This is because.

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the mass of the atom is itself fractional

Atomic masses are average mases of Isobars

Atomic masses are average masses Isotopes

Atomic masses are average masses of Isotopes proportional to their relative abundance.

the substance which increase the rate of reaction but remains unchanged at the end of the reaction is called.

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Indicator

Promoter

Catalyst

Activated complex

In discharge tube, properties of X-rays depend upon the nature of.

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Residual gas

Cathode plate

Anode plate

All of these

Which statement is correct about the given reaction.

2NaOH + Cl2 --------------- NaCl + NaCIO + H2O

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Cl is oxidized and O is reduced

Cl is reduced and O is oxidized

Cl is oxidized as well as reduced

Neither Cl nor oxygen is reduced or oxidized

The substance which is added to remove impurities is known as

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Slag

Flux

Ore

Gangue

The anhydride of HCIO₄is

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CIO₃

CIO₂

Cl₂O₅

Cl₂O₇

SN₂reactions can be best carried out with

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primary alkyl halides

secondary alkyl halides

tertiary alkyl halides

All the three

A gas decolorizes alkaline KMnO4 but has no action with ammoniacal AgNO3, this gas may be

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C2H2

C2H4

C2H6

CH4

Out of all the elements of Group V-A the highest ionization energy is possessed by

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N

P

Sb

Bi

A solution of borax in water is.

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Acidic

Alkaline

Neutral

None of these

Which one of the following Lipids does not have glycerol backbone.

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Cholesterol

Oil

glycogen

Vitamin D

The conversion of ethene to ethanol is an example of.

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Hydration

Dehydration

Neutralization

Esterification

Ozone is mostly produced in

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Tropical region

North polar region

South polar region

Thermosphere zone of atmosphere

The word alkali is derived from which language

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Arabic

Greek

French

German