Question # 1

Which molecule has single covalent bond?

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O₂

N₂

CI₂

CO₂

The amount of energy given out when an electron is added to any atom is called:

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lattice energy

ionization energy

electronegative

electron affinity

The lowest energy level is

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K

L

M

N

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

How many covalent bond does C₂H₂ molecule have?

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two

three

four

five

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

10 gram sugar is dissolved in 90 gram of water to make a 100 gram solution.This solution is

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10% m/m

10% m/v

10% v/m

10% v/v

1 atm = ?

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1 pascal

760 mm of Hg

1 atm

1 Nm^-2

The types of solutions on the basis of their physical states are

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3

6

9

12

Mixture has _________ types.

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3

2

1

No types

When an electronegative element combines electropositive element the type of bonding is

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covalent

ionic

polar covalent

coordinate covalent

|Which one is not an Arrhenius acid?

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HCl

H2SO₄

CO₂

HNO₃

___________ is not mineral acid.

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HCl

CH₃COOH

H₂SO₄

HNO₃

When copper pyrite (CuFeS2) is strongly heated in excess of airit converted into mixture of:

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Cu2S + Cu2O

Cu2O +FeS

Cu2S + FeS

FeO + SO2 + Cu2S

The region of ozone decomposition in stratosphere is.

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20 km

30 km

40 km

50 km

Temporary hardness can be removed by__________.

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Quick lime

Slaked lime

Lime stone

HCl

Chemical form of gypsum.

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MgSO₄. 5H₂O

CaSO₄. 2H₂O

FeSO₄. 5H₂O

CuSO₄. 5H₂O

Which one contains double covalent bound?

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Pentane

Ethylene

Acetylene

All

When bromine water is added to acetylene its red-brown colour is changed into:

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red

green

violet

discharged

In a Reversible Reaction if Qc = Kc then.

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Reaction is occuring in forward direction

Reaction is occuring in Reverse direction

Equilibrium has been allained

Reaction is not at equilibrium

What is the percentage of carbon in anthracite?

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60%

70%

80%

90%

Extraction of metals from its ores is called.

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Metallurgy

Mining

Griding

All

The pH of 10-3 mole dm-3 of an aqueous solution of H2SO4 is.

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3.0

2.7

2.0

1.5

Pressure remaining constant at which temperature the volume of a gas will become twice of what it is at 0° C

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546°C

200°C

546 K

273 K

Many elements have fractional atomic masses. This is because

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The mass of the atom is itself fractional

Atomic masses are average masses of isobars

Atomic masses are average masses of isotopes

Atomic masses are average masses of isotopes proportional to their relative abundance

The substance used for decolorization of crystalline substance is

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G2O5

Chloroform

Animal charcoal

Soda ash

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

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

In endothermic reactions, the heat content of the

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Products is more then that of reactants

Reactants is more than that of products

Both a and b

Reactant and products is equal

The gain of electron is known as.

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Oxidation

Reduction

Dehydration

Dehydrogenation

Ionic solid are characterized by.

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Low melting point

Good conductivity in solid state

High vapours pressure

solubility in polar solvent

In stoichiometric calculations

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The reaction can be reversile

Side products can be formed

Law of conservation of mass may not be obeyed

Law of definite proportions is definitely obeyed

Lyman series lies in spectral region

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Infrared

Ultra violet

Visible

None of these

Down's cell is used to prepare.

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Sodium carbonate

Sodium bicarbonate

sodium metal

Sodium hydroxide

In Pakistan, the total consumption of paper per person per year is.

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2 kg

5 kg

7 kg

10 kg

Boric acid cannot be used

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As antiseptic in medicine

For washing eyes

In soda bottles

For Enamals and Glazes

The process in when alkene are converted into carboxylic acid is known as

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Oxidation

Reduction

Hydrolysis

Hydration

Which one of the following is inorganic polymer

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Graphite

Rubber

DNA

Protein

Which element shows highest oxidation state among these

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Zn

Fe

Mn

Sc

The mean residence time of methane in atmosphere in

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1-2 years

3-4 years

3-5 years

3-7 years

A carbohydrate that cannot be acid hydrolysed is called.

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Monosaccharides

Di saccharides

Poly saccharides

Starch

An aldehyde is reduced to alkane with hydrazine is the presence of

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KOH

NaOH

CaO and NaOH

Ca(OH)2

Which ether is symmetrical in nature.

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Methyl ethyl ether

Diphenyl ether

Methyl n propyl other

Methoxy benzene

Which compound is called universal solvent

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CH₃OH

C₂H₅OH

CH₃O CH₃

H₂O