Question # 1

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

If N_A is Avogadro's number then number of valence electrons in 4.2 g of nitride ions N^3-is

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2.4 N_A

4.2 N_A

1.6 N_A

3.2 N_A

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

With increasing principle quantum number the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increases for higher value of Z.

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

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

Hybridization explain the------- of orbitals

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Type of Bonding

Shapes

Shape and Type of bonding

None of above

Sodium metal cannot be stored under

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Benzene

Kerosene oil

Alcohol

Toluene

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

The number of oxygen atoms in 4.4 g of CO₂is approximately

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1.2 x 10²³

6 x 10²²

6 x 10²³

12 x 10²³

Which species represents the electrpohile in aromatic nitrotaion?

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NO^-₂

NO⁺₂

NO2

NO^-₃

Propyne on hydrolysis is presence of H₂SO₄and HgSO_{4 gives}

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Acetaldehyde

Acetone

Formaldehyde

None

In public urinals, we observe some nascent smell. This smell is due to

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Hydrolysis of urea of urine by urease of atmosphere into NH₃and CO₂

Formation of sulphonic acid by urea of urine

Reaction of CO₂of atmosphere with urea mononitrate in urine

Hydregen present in air reacts with nitrogen forming NH₃

Which inorganic precipitate acts as semipermeabale membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. ZnCl₂

NaCl

PCl₅

SOCl₂

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

According to MO theory, the species O⁺₂

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

Which of the following has least mass?

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2 gram atom of nitrogen

3 x 10²³atoms of C

1 mole of S

7.0 g of Ag.

The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called

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Functional isomers

Position isomers

Chain isomers

Metamers

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

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