Question # 1

How many moles of Helium gas occupy 22.4 L at 0^oC at 1 atm.Pressure?

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0.11

0.90

1.0

1.11

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

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80^o

60^o

180^o

90^o

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Which of the following alkali metal hydroxides is the strongest base?

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LiOH

NaOH

KOH

CaOH

A clathrate may be defined as a

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Cage compound

Liquid crystal

Mixture

Solid solution

Which one of the following elements occurs free in nature?

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N

P

As

Sb

Which of the following process is used to separate insoluble particles from liquids?

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Separation

Filtration

Crystallization

Condensation

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

Which is the most amphoteric?

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Na₂O

MgO

AI₂O₃

CaO

The formula of nitre is

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KNO₃

NaNO₃

NaCI

Na₂CO₃

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

The reagent which forms crystalline osazone derivation when treated with glucose is

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Fehling solution

Phenyl hydrazine

Benedict solution

Hydroxyl amine

The maximum number of electrons in a subshell for whichι = 3 is

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14

10

8

4

Which for the following has greatest reducing power?

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Hl

HBr

HCl

Hl

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

An electrolyte

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Forms complex ions in solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

Which has maximum protein content?

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Ground nut

Cow milk

Egg

Wheat

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

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Helium is much less soluble in blood than nitrogen

Helium is much less soluble in blood than helium

Under the sea nitrogen and oxygen react to give poisonous nitric oxide

Nitrogen is highly soluble in water.

Vital force theory was rejected by

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Berzelius

Kolbe

Wholer

Lavoiser

The ratio of the ionization energy of H and Be³⁺is

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1 : 1

1 : 3

1 : 9

1 : 16

The reaction/method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide.

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