Question # 1

Which of the following statement is not related with environmental pollution.

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Direct or indirect change in any component of the biosphere

Undesirable change in the physical characteristics of the air

Undesirables change in the biological characteristics of the soil

not affecting adversely the industrial progress

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

The common host compound for the formation of inclusion compound is.

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Urea

Thiourea

Cholic acid

All above

Which of the following linear polymer.

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Polypeptide

Protein

Starch

Phenol formaldehyde resin

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

The atomic number of Potassium is 19 and that of manganese is 25. Although the coloured of MnO4 is dark violet yet the K+ is colourles.. This is due to the fact that

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Mn is a transition element while K+ is not

[MnO4]is negatively charged while K+ has a positive charge

The effective atomicnumebr of Mn is [MnO4] is 26 while for K+ the atomic number is 18

The Mn in a high positive oxidation state allows charge transfer transitions

Nitrogen (N2)) is relatively unreactive because.

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Its electronegativity is high

Its dissociation energy is large

Its atomic radius is small

It is the first element of group 15

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

Metal crystallize is system having co ordination number

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8

12

14

any one of above

How many varieties of commercial iron are known.

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1

2

4

3

What element is added to copper to make it extremely hard.

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Aluminum

Zinc

Lead

Tin

Which of the following is not a component of hollow cathode lamp.

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Anode

Cathode

Filter gas

Atomic vapour

Which of the following techniques involves the distribution of solute between two immiscible liquid phases.

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Chromatography

Electrophoresis

Solvent extractions

Solid phase extraction

Which of the following a -amino acid is not capable of exhibiting optical isomerism.

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Glycine

Leucine

Arginine

Alanine

The capacity of normal human eye to see the smallest object is _______ micro meter

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10000

1000

100

10

For highly paraffine , crude oil, the characterization factor will be in range of

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11.5-12.5

12.5-13.0

13.5-14.0

13.4-15.0

The emission of light in a biological reaction in known as.

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Fluorencence

Phosphoreacence

Biolumineacence

Phtolysis

The rate of a chemical reaction is proportional to the product of the active mean of the reactants, This is a statement of.

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Law of dynamic equilibrium

Le Chatlier's principle

Law of mass action

Solubility product principle

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Molecule of oxygen is

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Diamagnetic

Paramagnetic

Both A and B

None of above

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

Potassium crystallizes in a body centered lattice. Hence, the coordination number of potassium in potassium metal is.

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4

6

8

12

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

The by -product of the process of saponification is.

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Methanol

Glycol

Glycerol

Absolute alcohol

Which of the following statement is not true is case of catalytic reforming.

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Dehydrogenations high endothermic

Dehydrogenation is exothermic

Hydrodealkylation reactions are endothermic

None of these

The ionization energy of N is more than that of oxygen becasue.

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Nitrogen has half filled p orbitals

Nitrogen atom is smaller in size than oxygen atom

Nitrogen contains less number of electrons

Nitrogen is less electronegative

The splitting of H2O can be carried out through

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Photolysis

Electrolysis

Dialysis

Hydrogenation

The lowest K.E. for an electron is three dime national cubic box is given by

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h²/ 8m^a

3h² / 8 ma²

9h²/ 8ma²

16h² / 8ma²

The equivalent conductance of a 1 N solution of an electrolyte is nearly

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The same as its specific conductance

10³ times more than its specific conductance

10-3 times its specific conductance

100 times its specific conductance.

The process of extracting a metal in pure form its ores is known as.

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Crushing

Grinding

Dressing

Metallurgy

Maximum desirable concentration of fluorides according to international standard is.

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10-100 ppm

1 ppm

100-200 ppm

10-20 ppm

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