Question # 1

When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase

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Pressure axis

Volume axis

1/V axis

1/P axis

The gasses in the atmosphere are essential for sustaining life on earth; Thus oxygen is required for breathing, What for is carbon dioxide required?

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to help plant to under go photosynthesis

to destroy nitrogen oxide form the atmosphere

to help to clean to atmosphere

to help in fixing of bacteria

The formation of PVC from vinyl chloride is an example of

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subtsitution reaction

addition polymerization

condensation polymerization

condensation reaction

The one atmospheric pressure of air in term of pound per square inches is

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101.325

1.01325

760

14.7

If a gas expands at constant temperature

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The pressure decreases

The Kinetic energy of the molecules remains the same

The kinetic energy of the molecules decreases

The number of molecules of the gas increase

The main pollution of leather tanneries in the waste is due to the salt of

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Chromium

Copper

Chromium

Lead

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

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

A state function which describes together the internal energy and product of pressure and volume is called

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Enthalpy

internal energy

Work

Kinetic energy

UV rays inactivate enzymes because they

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change sequence of amino acids of enzymes

They add prosthetic group to them

They increase their specificity

affect structure of enzymes

Graham s law refers to

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Boiling point of gases

Gas compression problems

Gaseous diffusion

Volume changes of gases due to change in temperature

Ascorbic acid is a chemical name of

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Vitamin D

Vitamin A

Vitamin C

Vitamin B₆

N-atom forms three covalent bonds, its electronic configuration is

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Coal is used to bake bricks in lime kiln:

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40%

60%

80%

None of these

Which of the following fibres are made of polyamides?

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Dacron

Orlon

Nylon

Rayon

Which is not the enzyme involved in the preparation of ethyl alcohol by fermentation of starch

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Diastase

Maltase

Zymase

Invertase

Which one of the following reagents will distinguish between C₆H₅CHO and C₆H₅COCH₃

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Aqueous bromine

Phosphorus pentachloride

2, 4 DNPH

Tollen's reagent

C₆H₁₂O₆and C₁₂H₂₂O₁₁ are:

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Mono-atomic molecules

Diatomic molecules

Poly-atomic molecules

Hetero atomic molecules

I a chemical reaction equilibrium is said to have been established when :

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Rate of opposing reactions are equal.

Rate constants of opposing reactions are equal.

Opposing reactions stop.

Concentration of reactants and products are equal

Bell metal is an alloy of Sn and

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Copper

Iron

Zinc

Magnesium

The vapour pressure of two liquids 'p' and 'Q' are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

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140 torr

20 torr

68 torr

72 torr

Aspirin is

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Acetyl salicylic acid

Phenyl salicylic acid

Salicylic acid

Benzoic acid

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