Question # 1

Which one is moderate reactive metal?

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Pb

Na

Ca

Mg

Sodium - potassium alloy is used in nuclear reactor as a:

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catalyst

coolant

reactant

absorber

Films are coated by special chemical known as ____________ detectors.

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Photographic

Image

Nil

Both

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

The equation of relationship between atomic number (Z) and mass number (A) is

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A = Z + N

A = Z - n

A = Z

A =2Z + n

Gain of electrons in a reaction is called ____________reaction.

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Oxidation

Reduction

Both

Nil

_________ elements naturally occurring.

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92

118

93

117

4th & 5th consist of ________________ elements.

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8

18

32

infinite

Water dissolves ____________ compound.

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Ionic

Polar covalent

A & B

Nil

Fog is an example of ____________ in gas.

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Solid

Liquid

Gas

Plasma

The quantity of a matter in a body is called ____________

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Mass

Weight

Atom

Molecule

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

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