Question # 1

When KCIO₃ is heated it decomposes into KCI and O₂ if some MnO₂ is added the reaction goes much faster because

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MnO₂ decomposes to give O₂

MnO₂ provides heat by reacting

Better contact is provided by MnO₂

MnO₂ acts as a catalyst

The carbon atoms in calcium carbide are held by

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Ionic bonds

2 sigma bonds

2 covalent one co-ordinate bond

2 π and one σ bond

Vitamin A is present in

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Liver

Milk

Green vegetables

All

Ethyl chloride on treatment with aqueous alkali gives

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Ethane

Ethene

Ethanal

Ethanol

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

The treatment of benzene with isobutene in the presence of sulphuric acid give

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Isobutyl benzene

Tert-Butyl benzene

n-Butyl benzene

no reaction

In the equilibrium

N₂ + 3H₂ - 2NH₃ + 22 kcal the formation of ammonia is favoured by

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Increasing the pressure

Increasing the temperature

Decreasing the pressure

Adding ammonia

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.

Heating a micture of sodium benzoate and soda lime gives

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Benzene

Methane

Sodium benzoate

Calcium benzoate

Which is the most amphoteric?

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Na₂O

MgO

AI₂O₃

CaO

The rate of reaction between A and B increases by a factor of 100 when the concentration with respect to A is increased 10 folds the order of reaction w.r.t A is

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10

1

4

2

The structure of XeF6

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Distorted octahedral

Pyramidal

Tetrahedral

None of the above

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

A clathrate may be defined as a

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Cage compound

Liquid crystal

Mixture

Solid solution

Which of the following imparts violet colouration to non-luiminous flame of Bunsen burner?

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NaCl₂

BaCl₂

CaCl₂

KCl

The IUPAC name of the compound having the formula (CH₃)₃C - CH = CH₂is

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1, 1-Dimethyl-3-butene

1, 1, 1-Trimethyl-3-propene

3, 3,-Dimethyl-1-butene

3, 3, 3,-Trimethyl-1-propene

The percentage of oxygen in NaOH is

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40

60

8

10

Which one is not a pollutant normally?

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Hydrocarbons

Carbon dioxide

Carbon monoxide

Sulphur dioxide

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

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 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

The principal constituent of pyrex glass

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Zn

B

Pb

Cl

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