Question # 1

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

A single chloride free redical can destroy bow many ozene molecules?

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100

100000

10000

10

The number of reacting molecules whose concentration change during reaction is called

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Activated molecule

Rate of reaction

Order of reaction

half-life

Which of the following substance is not present in acid rain?

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Sulphuric acid

Nitric acid

Sulphurous acid

Acetic acid

In which of the following compounds H-binding is not present?

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ethanol

ether

water

ammonia

Among the following, which one is nucleophile

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H+

Ca2+

OH-

Na+

When a metal rod is dipped in its one molar ionie solution

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Electricity is produced

Electricity is consumed

Redox reaction occurs

Potential difference is set up

For gas obeying Boyle's law if pressure is double, the volume becomes:

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Remains constant.

Double.

One half.

None of above.

Total pressure of mixture of two gases is:

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The ratio of their partial pressure

The product of their partial pressure

The difference partial pressure

The sum of their partial pressure

Hardness which can be removed by boiling is called

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Permanent hardness

Temporary hardness

Stiffness

Toughness

The process of coagulation can remove suspended solids in raw water about

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50%

60%

Less than 40%

More than 80%

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

Sintered glass is porous material used for:

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Absorption

Decoration

Filtration

All of above

pKb value of NH₄OH is 4.74. If the concentration of NH₄OH is 1 molar containing 0.1 molar NH₄Cl, then pH of this buffer will be

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3.74

10.26

4.74

9.26

Polysaccharides are also called

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Crystals

Sugars

Liquids

None sugars

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

Grignard's reagent is

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Alkyl halide

Magnesium halide

Alkyl magnesium halide

Ethereal solution of an alkyl halide

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

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Excitantion of an electron from 2s to 2p-orbital

Transfer of three electrons from B to the other atoms

Excitation of two electrons form 2s orbital to 2p orbital

Formation of molecular ion

Which one is a nitrogen fertilizer

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Urea

Calcium sulphate

Potassium phospahte

Magnesium carbonate

The monomeric units of starch is/are

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Glucose

Fructose

Glucose and fructose

Mannose

The number of amino acids found in proteins that a human body can synthesize is

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20

10

5

14

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