Question # 1

Acid rains are produced by

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Excess NO₂ and SO₂from burning fossil fuels

Excess production of NH₃ by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂ by combustion and animal respiration

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

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.

Sulphure dioxide affects

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Cell wall

Plasmodesmata

All membrane systems

Nucleus

Saturated solution of NaCl on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

The percentage of oxygen in NaOH is

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40

60

8

10

Which inorganic precipitate acts as semipermeabale membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde.

The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is

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22.4 litres

11.2 litres

1 litre

2.24 litres

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

The rotation of two carbon atoms joined by double bond would happened only if

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P_ibond is broken

Sigma bond is broken

Both bonds are broken

None of above

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

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Chlorination, nitration, reduction

Nitration, Chlorination, reduction

Nitration, reduction, chlorination

Nitration, reduction, acylation, chorination, hydrolysis

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. ZnCl₂

NaCl

PCl₅

SOCl₂

Benezene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

Salol is prepared from

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Salicyclic acid and phenol

Salicyclic acid and methyl alcohol.

Both

None

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