Question # 1

In metal hydrides, the oxidation number of hydrogen is

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+1

-1

+2

-2

Oxidation means

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Gain of oxygen

Removal of oxygen

Gain of hydrogen

Gain of electrons

____________ solids are arranged in 3 dimension.

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Crystalline

Amorphous

Both

None

Li belongs to ________________ block.

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s

p

d

f

The earth is made up of ___________ % of calcium.

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4

5

6

7

One atmospheric pressure is equal to how many pascals?

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101325

10325

106075

10523

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

The core of the earth is ____________ than crust.

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LIghter

Heavier

Both

Nil

The symbol of sodium is :

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Sa

Na

Pa

Ca

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

Half life of C-14 ________________ years.

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5800

5700

5600

5500

Neutrons have _________ charge.

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+

_

No

Nil

When U-235 breaks up, it produces?

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electrons

neutrons

protons

nothing

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