Question # 1

When KClO₃is heated, it decomposes into KCl and O_{2. If some MnO2 is added, the reaction goes much faster because}

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MnO₂decomposes to give O₂

MnO₂provide heat by reacting

Better contact is provided by MnO₂

MnO₂acts as a catalyst.

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

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120° . 28'

60°

90°

109°

Which of the substances Na, Hg, S, Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution?

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Na, Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

The pore size of filter paper depends upon

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Nature of the medium

Temperature of the medium

Size of particles

Mass of the particles

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

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Al

Ag

Au

Fe

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fuorine

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

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

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

Fertililzer are made by

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Nature only

Artificial methods only

Both artificial and natural methods

None of the above

One mole of 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 litres of a gas at S.T.P.

Ascorbic acid is chemical name of

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Vitamin D

Vitamin A

Vitamin C

Vitamin B6

Vitamin A is present in

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Liver

Milk

Green vegetables

All

ΔH_{neutralisation}is always

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positive

Negative

Zero

Positive or negative

Which one is not usually used for the crystallization?

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Acetone

Acetic acid

Sulphuric acid

Chloroform

Inert pair effect plays an important role in case of

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F

Al

Si

Tl

If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately

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800mL

200mL

10mL

Zero

Which of the following statement regarding catalyst is not true?

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A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst can initiate a reaction

A catalyst dose not alter the equilibrium in a reversible reaction

Catalysts are sometimes very specific in respect of reaction.

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

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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