Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 17

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IMPORTANT

Earn 100

The symbol of element cobalt is $CO$

53.33% studentsanswered this correctly

Important Questions on Atoms and Molecules

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 18

Define 'molecular mass' of a substance.

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 19

What is meant by saying that 'the molecular mass of oxygen is

32

'?

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 20

In water, the proportion of oxygen and hydrogen is _____ by mass.

A : $1 : 4$

B : $1 : 8$

C : $8 : 1$

Enter your correct answer as A, B or C.

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Very Short Answer Type Questions>Q 20

In a chemical reaction, the sum of the masses of the reactants and the products remain unchanged. This is called the law of conservation of _____.

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Short Answer Type Questions>Q 21

(a) Name the element used as a standard for atomic mass scale.

(b) Which particular atom of the above element is used for this purpose?

(c) What value has been given to the mass of this reference atom?

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Short Answer Type Questions>Q 22

Give one major drawback of Dalton's atomic theory of matter.

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Short Answer Type Questions>Q 23

Dolton's atomic theory says that atoms are indivisible. Is this state valid? Give reason for the your answer.

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Short Answer Type Questions>Q 24

Is it possible to see atoms these days? Explain your answer.