Question # 1

Which of the following can accommodate 18 electrons?

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K

L

M

N

All non-metals are non-conductor of heat and electricity except it

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Phosphorous

Sulphur

Graphite

Iodine

4th & 5th consist of ________________ elements.

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8

18

32

infinite

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

The molar mass of H₂SO₄ is:

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98 g

98 amu

9.8 g

9.8 amu

P1V1 = P2V2 is mathematical form of ____________ law.

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Bohr's

Charles

Boyle's

Nil

________________ is triangular in shape.

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BCL3

H2O

CO2

NH3

________________ proposed that matter is composed of small particles.

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Greek

English's

Russian

Nil

Deuterium is used to make:

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light water

heavy water

soft water

hard water

Transfer of electrons between atoms results in:

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metallic bonding

ionic bonding

covalent bonding

coordinate covalent bonding

Electrons carry _________ charge.

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+

_

Neutral

Bouble Positive

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

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O₂

CO

CO₂

CO₃

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 mineral acid.

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HCl

H₂SO₄

HNO₃

All of these

Which one of the following is a fat soluble vitamin?

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A

E

K

All of these

Which one is a pentahydroxy ketone?

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sucrose

glucose

fructose

lactose

For which reaction Kf is the rate constant?

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Forward reaction

Backward reaction

Upward reaction

Downward reaction

The bond angle between H-O-H in water is:

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104.5^o

104.6^o

104.7^o

104.8^o

The color of Iodine is:

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Purple

Black

Red

Pink

Sindh alkalies limited was established near Karachi in.

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1965

1966

1970

2000

Formula of Potassium ferrocyanide.

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K₄[Fe(CN)₆]^-4

K₃[Fe(CN)₄]^-3

K₂[Fe(CN)₆]^-4

K₄[Fe(CN)₅]^-4

Main component of natural gas is

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Methane

Propane

Butane

Propene

A limiting reactant is one.

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Which is present in least amount

Which produces minimum number of moles of product

Which produces maximum number of moles product

Does not effect the amount of product.

Rutherford's model fo atom failed because

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The atom did not have a nucleus and electrons.

It did not account for the attraction between protons and neutrons.

It did not account for the stability of the atom

Their is actually no space between the nucleus and the electrons.

The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is.

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1:1

1:2

1:32

1:4

In zero order reaction, the rate is independent of.

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Temperature of reaction

Concentration of reactants

concentration of products

None of these

What are the SI units of Van der Waal constant 'a'

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atm dm3 mol-2

atm dm6 mol-2

Nm4 mol-2

Nm mol-1

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

The volume occupied by 1.4 g of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

The sum of all kinds of energies of atoms, ions or molecules of a system is known as.

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Kinetic energy

Potential energy

Internal energy

Solar energy

A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of the gas

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Becomes 2 times

Becomes 4 times

Become half

Remain same

A molecule has two ions pairs and two bond pairs around the central atom. The shape of molecule is.

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Linear

Pyramidal

Angular

Tetrahedral

All of the followings react with Fehling solution except

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CH2CH2CHO

CH3-CH2COCH3

HCHO

CH3-CHO

The shape of SiO2 IS

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Tetrahedral

Trigonal bipyramid

Linear

Cubic

When water is added to plaster of paris, it changes to a hard mass. Its volume also expands upto

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1%

2%

3%

5%

Chlorine heptoxide (CI₂O₇) reacts with water to form

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

Co-ordination number of Pt in Pt Cl(NO₂)(NH₃)₄

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2-

4

1

6

The halogens ae best described by which of the following statements.

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Their outer shell is complete

Most of them are colourless

They all are oxidizing agent

They all are gases at room temperature

Which substances is called chrome yellow.

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Pb3O4

PbO

2PbCO3.Pb(OH)2

PbCrO4

Lowest oxidation state of nitrogen is present in.

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NH3

NO2

NO

HNO3

Out of all the elements of groups VI-A the highest melting and boiling points is shown by the element

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Te

Se

S

Po

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

Which one is cyclic amino acid

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Glycine

Alanine

Proline

Aspartic acid