Question # 1

In which of the following elements +1 oxidation state is more stable than +3

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B

AI

Ga

Ti

Hydrolytic conversion of sucrose into glucose and fructose is known as

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Induction

Inversion

Insertion

Inhibition

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

In Friedal-Craft's alkylation besides AICI3 the other reactants are

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C6H6 + NH3

C6H6 + CH4

C6H6 + CH3CI

C6H6 + CH3COCI

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysus

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

Bragg's law is given by equation

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n λ = 2 θ sin θ

n λ = 2 d sin θ

2nλ = d sin θ

nλ = 1/2 d sin θ

The bond angle H - O - H in ice is closest to

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120° , 28°

60°

90°

109°

Carbon atom holding halogen in aryl halides is

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Sp²-hybridesed

Sp³-hybridesed

Sp-hybridesed

Sp³d -hybridesed

In which molecule carbon atom is sp²hybridized

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CH₄

C2H₄

C₂H₂

None of the above

If the solvent is inflammable for heating purpose we use

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Ice bath

Water bath

Wire gauze

Thermostat

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

A current of 9.65 ampere flowing ofr 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

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10

50

30

96.5

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Phenol is heated with CCl₄and alkaline KOH when salicylic acid is produced. The reaction is known as

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Frledel-Craft reaction

Riemer-Tiemann's reaction

Rosenmund's reaction

Sommelet reaction

Crystal can be classified in to -------------- basic crystal habits

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7

3

14

3

Benezene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

Red P can be obtained from white P by

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Heating it with a catalyst in an inert atmosphere

Distilling it in an inert atmosphere

Dissolving it in CS₂and crystallzing

Melting it and pouring the liquid into water

Al is more reactive than Fe but Al is less easily corroded than Fe because

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It is a noble metal

oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

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