Question # 1

suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air:

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77cm

76cm

79cm

78cm

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.

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30

3000

3

300

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

Polyesters resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

A semiconductor of Ge can be made p-type by adding

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Trivalent impurity

Tetravalent

Pentavalent impurity

Divalent impurity

There are 20 amino acids found in protein which is not the property of these amino acids

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They are all alpha-amino acids

They are all optically active

They have high decomposition point

They are water soluble

Amino acid which has cyclic structural is

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Proline

Valine

Alanine

Glutamic acid

^{The common oxidation number of halogens is}

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-1

+1

-2

0

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2-bromo-3-methylbutane

3-methyl-2-bromobutane

2-methyl-3-bromobutane

All of these

Cyanoform is ________ acid in nature than the chloroform. The missing word is

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Stronger

Weaker

Amphoteric

Neutral

At room temperature, the mole fraction of a solution in 0.25 and the vapour pressure of the solvent is 0.80 atm. Then the lowering of vapour pressure is

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0.75

0.512

0.80

0.0512

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

What is the total number of different chloroethanes, formula C₂H_6-nCl_n, where n can be any integer from 1 to 4

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4

6

7

8

The relative lowering of vapour pressure is equal to the mole fraction of the solute, This law is called

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Henry's law

Raoult's law

Ostwald's law

Arrhenius law

Which one of the following substance is use as decolonizing agent

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Asbestos

Animal charcoal

conc, H₂SO₄

Silica gel

A pollutant affects

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Human health

Quality of life

Functioning of ecosystem

All of these

Homologues differ from each other by an integral number of

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CH₂groups

CH₃groups

CH groups

CH₄groups

Which is not the enzyme involved in the preparation of ethyl alcohol by fermentation of starch

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Diastase

Maltase

Zymase

Invertase

What is the nature of Al₂O₃

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Acidic

Basic

Amphoteric

Neutral

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