Question # 1

Which of the following possesses the highest melting point?

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Chlorobenzene

o- Dichlorobenzene

m-Dichlorobenzene

p-Dichlorobenzene

Chile salt petre is

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NaNO₃

Na₂SO4

KNO₃

Na₂S₂O₃

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fuorine

Wholer prepared urea from

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Ammonia

NH₄CNO

NH₃

Uric acid

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic

it is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

Chief air pollutant which is likely to deplete ozone layer

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Suphure dioxide

Carbon dioxide

Nitrogen oxides and chloro flrorocarbons

The unit rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

Hybridization explain the ----------- of orbitals

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Type of Bonding

Shapes

Shape and Type of bonding

None of above

Water (H_2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

The number of oxygen atoms in 4.4 g of CO₂is approximately

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1.2 x 10²³

6 x 10²²

6 x 10²³

12 x 10²³

Which has maximum protein content?

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Ground nut

Cow milk

Egg

Wheat

A cell constant is generally found by measuring the conductivity of aqueous solution of

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BaCl₂

KCl

NaCl

MgCl₂

The maximum number of electrons in a subshell for whichι = 3 is

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14

10

8

4

As a fixing agent in photography, sodium thisoulphate is used for

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Dissolving out unreacted silver bromide

Converting silver halides to metallic silver

Reducing solubility of AgBr

Preventing overdeveloping and fogging.

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