Question # 1

The most common example of corrosion is:

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Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

The boiling point of H2O is:

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100

12

1.105

9

The SI unit of pressure is:

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N

N/m²

Pascal

atm

Neutrons have _________ charge.

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+

_

No

Nil

Electropositive character depends upon:

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Atomic size

Nuclear charge

Ionization energy

Electron affinity

All metals are solid except

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AI

Mg

Na

Hg

Which one metal can be cut with a knife?

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Na

Mg

AI

Ca

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

The No. of atoms in 1 mole of carbiton is

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6.02 x 1021

6.02 x 1022

6.02 x 1023

6.02 x 1024

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

The core of the earth is ____________ than crust.

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LIghter

Heavier

Both

Nil

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

There are _________ elements found till now .

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120

118

119

117

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