Question # 1

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

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remain unchanged

increase four times

reduce to 1/4

be doubled

What is component of environment?

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Atmosphere

Hydrosphere

Lithosphere

All of these

Which one of the following has the lowest pH values

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0.1 M HCI

0.01 M HCl

0.1 M KOH

0.01 M KOH

The value of critical temperature of a gas depends upon its:

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Size

Intermolecular forces in it

Shape

All of above

Which is the optimum temperature for the activity of enzyme?

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20 - 35°C

10 -15°C

55 - 70°C

35 - 55°C

A chemical inert and heat resistant plastic, that is made from tetrafluoroethylene, is called

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teflon

PVC

Bakelite

polyamide

A solid nitrate fertilizer reacts with an alkali to produce a gas which turns damp pH paper blue:

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NO₃

NHO₃

NH₂O

N₂H₄O₃

Benzene cannot undergo the ------- directly

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

Moles of protons in 20g of SO3

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10

20

40

80

The density of a gas is 1.964 g dm-³ at 273K and 76 cm Hg The gas is

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CH₄

CO₂

C₂H₄

Xe

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

In which molecule carbon atom is sp²hybridized

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CH₄

C₂H₄

C₂H₂

None of the above

Antibonding MO is formed by

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Addition of atomic orbitals

Substraction of atomic orbitals

Multiplication of atomic orbitals

None of these

[Ti(H₂O)₆]⁺³ion absorbs colour:

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Blue

Yellow

Green

Red

Which one of the following mixture shows positive deviation form Rault's law and forms an azetrope with minimum boiling point

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Methanol + CCI₄

Methanol + acetone

Ether + HCI

Acetone + chloroform

Macromolecules or polymers are large molecules built up from small molecules called monomers. This hypothesis put forward by

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Schrodixger

Standinger

Lewis

Newton

At present cement plants in Pakistan are:

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Ten

Twenty Two

Four

Twenty Four

Formula of acetone is:

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HCHO

CH₃CHO

CH₃OCH₃

CH₃OC₂H₅

Corrosion is basically a

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Altered reaction in presence of H₂O

Electrochemical phenomenon

Interaction

Union between two light metals and a heavy metal

The base used in Cannizzaro's reaction is

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NaOH

KOH

CHI₃

All of these

The molar boiling point constant is the ration of elevation in boiling point to :

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Molarity

Mole fraction of solvent

Mole fraction of solute.

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