Question # 1

Which one is not usually used for the crystallization?

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Acetone

Acetic acid

Sulphuric acid

Chloroform

The formula of nitre is

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KNO₃

NANO₂

NaCl

Na₂CO₃

Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

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Their metallic character decreases

The stability of +2 oxidation state increases

Their ionization energy increases

Their atomic size decreases

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.

Ionic solids with defects, contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacancies

Cation vacancies only

Cation vacancies and interstitial cations

What quantity of limestone (CaCO₃) on heating will give 56 kg of CaO?

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1000 kg

56 kg

44 kg

100 kg

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

The rate at which a substance reacts depends on its

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Atomic weight

Equivalent weight

Molecular weight

Active mass

In which molecule carbon atom is sp²hybridized

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CH₄

C2H₄

C₂H₂

None of the above

Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to

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The formation of less stable carbonium ion

Resonance stabilization

Larger carbon -halogen bond

The inductive effect

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic subsitution reactions

Nucleoophilic addition reactions

Nucleophilic substitution reactions

Which species represents the electrpohile in aromatic nitrotaion?

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NO^-₂

NO⁺₂

NO2

NO^-₃

The carbon atoms in calcium carbide are held by

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Ionic bonds

Sigma bonds

2 covalent, one co-ordinate bond

2π and oneα bond

Which of the following reaction is used for detecting presence of carbonyl group?

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Reaction with hydroxylamine

Reaction with hydrazine

Reaction with phenyl hydrazine

All

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

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