Question # 1

Which one metal can be cut with a knife?

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Na

Mg

AI

Ca

Mass no is represented by :

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A

B

C

D

Smoke in air is the example of solution.

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Gas in Gas

Gas in liquid

liquid in Gas

Solid in Gas

In double covalent bond, every atom provides

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1 electrons

2 electrons

4 electrons

6 electrons

The vapour pressure of a liquid increase with the:

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increase pressure

increase of temperature

increase of intermolecular forces

increase of polarity of molecules

First energy level is denoted by:

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K

L

M

N

Which one is largest?

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Exo

Peta

Atto

Pico

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

The no.of elements in the first period is

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2

8

18

23

..................... is property of metals.

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Gases

Lustrous

Solids

Nil

________________ cannot be seen by naked eye.

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Matter

Molecules

Solid

Liquids

Major portion of ozone layer is foun in.

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Chemical formula of amino group is

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NH₃

NH₂

NH₄

COOH

Deficiency of Vitamin E causes.

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rickets

Scurvy

Anemia in babies

Night blindness.

Which of the following salt is soluble in water.

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NaCl

KCl

Na₂SO₄

All of them

Alkynes are also called.

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Olefine

Ethene

Paraffins

Acetylenes

Which one of the following species is not amphoteric?

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H₂O

NH₃

HCO₃

SO₄

The smell of photocopies machine is due to the presence of.

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Chlorine gas

Neon gas

Helium gas

Ozone gas.

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

Word "acid" derived from:

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Urdu

English

Latin

Greek

Which of the following gas is used to destroy harmful bacteria in water.

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Iodine

Chlorine

fluorine

Bromine

The general formula of alkynes is

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C_nH_2n

C_nH_2n+2

C_nH_2n-2

C_n H_2n+1

The temperature which partially immiscible pair of liquid leads to the formation of a single phase in called.

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Transition temperature

Absolute temperature

Consulate temperature

Room temperature

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

Which is not chargeable cell

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Lead accumulator

NiCAD cell

Fuel cell

Alkaline battery

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

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

The volume occupied by 1.4 g on N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

Existence of an element in more than one crystalline form is known as.

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Anisotropy

Allotropy

Isomorphism

Unit cell

What are the SI of excluded volume 'b' in Vander waal equation.

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dm³ mol -1

m3 mol -1

mol dm-3

mol m-3

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

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-4

-2

+2

+4

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

Equal masses of methane and oxygen are mixed in an empty container at 25 ^oC. The fraction of total pressure exerted by oxygen is.

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1/3

8/9

1/9

16/17

SO2 is not absorbed in water directly to form H2SO4 because.

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The reaction does not go to completion

The reaction is quite slow

The reaction is exothermic

SO3 is insoluble in water

Which one of the following gases is used in welding purpose usually

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Methane

Ethane

Ethene

Acetylene

Ortho boric acid on strong beating gives.

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Borax

Boron oxide

Metaboric acid

Tetraboric acid

Acetone reacts with HCN to form a cyanohydrin. It is an example of.

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Which one is chlorous acid

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HCIO

HCIO₂

HCIO₃

HCIO₄

Which one of the following is not steroid

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Cholesterol

Ergosterod

Female sex Harmons

Globulin

Which element does not have allotropic form

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Nitrogen

Phosphorous

Arsenic

Antimony

Which compound is the most reactive

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Benzene

Ethene

Ethane

Ethyne

In which layer of atmosphere, ozone is present.

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Thermosphere

Mesosphere

Stratosphere

Troposphere

Which compound is called universal solvent

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CH₃OH

C₂H₅OH

CH₃O CH₃

H₂O

Which furnace is used to prepared steel

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Blast furnace

Pudding furnace

Bessemer converter

Pyrite furnace