Question # 1

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄ or LiAIH₄?

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1-Propanol

2-Propanol

2-Methyl-2-propanol

Ethanol

Number of elements presents in the fifth period of periodic table is

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8

10

18

32

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

The freezing point of 1 molal NaCI solution assuming NaCI to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

The percentage of nitrogen in urea is

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46

60

70

80

When electrons revolve is stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Enzymes are

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Proteins

Mineral

Oils

Fatty acids

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

Which metal is protected by a layer of its own oxide?

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Al

Ag

Au

Fe

Which of the following halogens does not form its oxyacids?

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F

Cl

Br

I

Which is the most volatile compound?

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HI

HCl

HBr

HF

Which of the following is different from the other three oxides?

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MgO

SnO

ZnO

Cr₂O₃

The digestion of fats in the intestines is aided by

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Diffusion

Protection

Peptization

Emulsification

During the folding of filter paper the apex form angle of about

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80°

60°

180°

90°

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

Hydrolytic conversion of sucrose into glucose and fructose is known as

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Induction

Inversion

Insertion

Inhibition

A solution of sodium sulphate was electrolysed using some inert electrodes. The products at the electrodes are

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O_2,H₂

O_2,Na

O_2,SO₂

O_2,S_2O^2-₈

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