Question # 1

The concentration of reactants is increased by x, then equilibrium constant K becomes

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ln K/x

K/x

K + x

K

Which one of the following gases is used for artificial ripening of fruits

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Ethane

Ethyne

Methane

Propane

Which compound contains - OH in their molecule

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Alcohol

Phenol

Alcohol and phenol

Ether

Spraying of DDT produces pollution of

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Air

Air and water

Air and soil

Air, water and soil

The functional group of acid amide is

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Which is non typical transition element :

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Ni

Co

Y

Fe

At present the number of cement factories is Pakistan are

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20

22

25

30

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

Cellulose does:

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Satisfy human appetite

Stimulates intestinal peristalsis

Gives fibre and bulk to the food

All of these

General formula of aliphatic carboxylic acids:

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R---OH

R----COH

R----CO---R

RCOOH

Alkanes are gases :

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C₁-C₄

C₅-C₁₀

C₁₁-C₁₅

C₁₀-C₂₀

Li, Be, B, C, O, Fl Ne are elements of

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Second period

First period

Third period

Fourth period

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Moles^-2dm⁺⁶

No units

Mole dm^-3

Mole^-1dm^-3

The branch of chemistry which deals with the study of compounds containing carbon as an essential elements is called

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Physical

Inorganic

Nuclear

Organic

The compound prepared by a substitution reaction of benzene is

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Acetophenone

Glyoxal

Cyclohexame

Hexabromo cyclohexane

The chemical formula of Epson salt is

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MgSO₄

MgCl₂

MgSO₄. 7H₂O

MgCl₂. 7H₂O

1-Chlorobutane on reaction with alcoholic potash gives

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But 1-ene

Butan-1-ol

But-2-ene

Butan-2-ol

Termochemistry is the study of chemical reaction accompanying

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Heat change

Rate change

Mass change

Volume change

By applying Hess's law, we can calculate

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ΔH

ΔS

ΔF

K

In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms?

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Two

Three

One

Four

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

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Hear of reaction

Heat of formation

Heat of neutralization

Heat of combustion

The amount of Ni in stainless steel is

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3%

4%

5%

8%

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

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0.5

1.0

1.5

2.0

For a given process the heat change at constant pressure q_pis related to the heat change at constant volume (q_v) according to

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q_p= q_v

q_p< q_v

q_p> q_v

q_p= qv/2

Acetone is prepared by

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Oxidation of n-propyl alcohol

Oxidation of acetaldehyde

Pyrolysis of calcium acetate

Pyrolysis of calcium acetate as well as acetic acid

The change in heat energy at constant temperature is called

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Enthalpy change

Heat of vaporisation

Bond energy

Internal energy change

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Total pressure

Amount of A₂and B₂

Temperature

Catalyst

The bond length b/w atoms of hydrogen in the hydrogen molecules is:

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7.54 nm.

0.0754 nm.

0.754 nm.

0.00754 nm.

Which of the following is not correct about transition metals?

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Their melting and boiling points are high

Their compounds are generally coloured

They can form ionic or covalent compounds

They do not exhibit variable valency

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