Question # 1

Super conductors are derived from compounds of

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P-block elements

Lanthanides

Actinides

Transition elements

Elements of group IA and IIA are

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electronegative

neutral

electropositive

non-metals

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

According to charles law there will be a change in the volume of a given mass of a gas by 1/273 of its original volume at 0°C if the temperature of the gas is changed by

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10°

1°C

100°C

2°C

Half-lives required to convert 100% reactant to produet for a first order reaction are

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10

1000

100

Infinity

The hetero atom in py ridine is

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Oxygen

Nitrogen

Chlorine

Sulphur

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

What is true for a molecule with standard geometry

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It lacks a Ip

It can't be a donor

It can be an acceptor

All

Formation of Picric acid from phenol needs heating, one possible reason for it is

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acidity of phenol

e- donating nature of-OH

acidity of picric acid

e- with drawing effect of- NO2

Major cause of SO2 on global scale is

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Volcanoes

Electric sparks

Combustion

All

Real gases deviate at low temperature from ideal behaviour due to

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there is transitional motion of molecule

the collissions between the molecules are decreased

volume of gas is decreased

the inter molecular attractive forces become significant

In the chemical combination of sodium and hydrogen to form NaH:

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Hydrogen atom gains an electron.

Sodium atom gains an electron.

Both the atoms share the electron.

Coupling of Pb with its Pb⁺⁺/Pb = -0.13 V and Ag with Ag⁺/ Ag = +0.80 V, the cell reaction

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For which system does the equilibrium constant, KC has units of concentration

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Among O, C, F, Cl, Br, the correct order of increasing radii is

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F O C Cl Br

F C O Cl Br

F Cl Br O C

C O F Cl Br

Metallic conduction is due to the

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Movement of electrons

Movement of ions

Both a and b

None of these

Hydrogen gas and iodine vapours combine to form Hl at 425°C, the same composition of mixture is present if we start with decomposition of Hl. It suggests

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A static equilibrium

Law of mass action

A dynamic equlibrium

Irreversible reaction

Drawback DDT as presticide is

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I becomes ineffective after some time

It is less effective than others

It is not easily/rapidly degraded in nature

Its high cost

Boiling point of acetic acid is°C:

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116

117

118

119

The molar boiling point constant is the ration of elevation in boiling point to :

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Molarity

Mole fraction of solvent

Mole fraction of solute.

CO+ is an example of

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Stable molecule

Anionic molecule ion

Cationic molecular ion

Free radical

Which of all following compound is not possible

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