Question # 1

ΔH_{Neutralisation} is always

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Positive

Negative

Zero

Positive or negative

The percentage of nitrogen in urea is

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46

60

70

80

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

CsI

CsF

Which metal is protected by a layer of its own oxide?

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AI

Ag

Au

Fe

According to MO Theory the species O⁺₂ possesses

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

Number of elements presents in the fifth period of periodic table is

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8

10

18

32

Galena is an ore of

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Gallium

Lead

Tin

Germanium

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

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

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