Question # 1

The structure of protein helps protein to

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be in proper shape

attach substrate

perform is function

All of these

Exhaust fumes of cars contain which poisonous gas

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CH₄

C₂H₆

CO

All of these

Which is not a calcareous material?

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lime

clay

marble

marine shell

In which of the following molecules strongest hydrogen bond is shown

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water

ammonia

hydrogen fluoride

hydrogen sulphide

The disposal of domestic refuse, commercial and industrial solid wastes are studied under the title

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Solid waste management

Waste management

Solid management

Semisolid management

Digestion of carbohydrates begins in the:

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large intestine

small intestine

duuoderium

beccal cavity/mouth

Choose from the followings the correct statement about Born Haber cycle

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Born Haber cycle is different from Hess's law

The energy changes in a cyclic process is not zero

The lattice energy of crystalline substances can be calculated easily

None

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1

Which will not react with phenol

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NaOH

Br2

KMn04/OH-

Na

The mechanism of polymerization involves free addition Polymerization or condensation polymerization, Choose the correct statement:

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Polyester is an addition polymer

polythene is an addition polymer

polyviny chloride (PVC) is a condensation polymer

Polystyrene

Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100C.

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Colliding capability of molecule will become lower

Pressure will become one half

Temperature has no effect on freely moving molecules

Volume will be increased

The reference electrode is made by using

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ZnCl₂

CuSO₄

HgCl₂

Hg₂Cl₂

Covalent compound s mostly exist in the form of:

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Protons

Atoms

Neutrons

Molecules

The force which holds the atoms together to form a compound is called

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A chemical bond

Van der waal's force

Dispersion force

London force

Which one of the following reactions is not spontaneous

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1 mol of N₂O₄ was decomposed according to given equation in 1dm₃ container. At equilibrium x mole of N₂O₄ have dissociated. What is the value of K_C:

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2x/(1-x)²

4x²/(1-x)

4x/(1-x)

2x/(1-x)

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

The proteins which are derived by conjugated proteins are called as

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Simple protein

Complex protein

Derived protein

None

Shahi Qilla may be destroyed by

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Flood in Ravi

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

All the above

Elevation of boiling point is measured by

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Beckmann's apparatus

Lands Berger's method

Antifreeze apparatus

None of these above

Which of the following alkyl halides is used as a mathylating agent

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CH₂H₅l

CH₃l

C₂H₅Pr

C₂H₅Cl

Ionization potential increases in moving from left to right in a period

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Because nuclear charge increase

Because atomic size decrease

Both (a) and (b)

Because atomic size increases

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