Question # 1

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

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

One carbon is _________ times heavier than hydrogen.

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12

13

14

15

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

The symbol of barium is:

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Ba

Bi

Br

B

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

The atomic number of sodium is ............... .

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9

10

11

12

The symbol of lead us

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As

Pb

Sb

Na

The third abundant as found in the earth' crust is:

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Carbon monoxide

Oxygen

Nitrogen

Argon

It is heterogeneous mixture

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Sand

Milk

Air

Brass

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

Which one is largest?

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Exo

Peta

Atto

Pico

Protons carry _________ charge.

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+

_

No

Neutral

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