EASY
7th CBSE
IMPORTANT
Earn 100

For all elements, the smallest particle that can exist independently is an atom. Do you agree? Give reasons.

Important Questions on Structure of Matter

EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 3
Most elements are found in a free state in nature. Do you agree? Give reasons?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 4
A scientist found that two samples of the same compound had the same elements combined in different ratios. Was the finding correct?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 5
The same scientist as above found that two samples of a mixture of the same elements had the elements mixed in different ratios. Was the finding correct this time?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 1
What is the difference between the symbol and the formula of oxygen?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 2
What specific name is given to 'the number of hydrogen atoms that can combine with or be displaced by one atom of an element'? Is this a modern definition?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 3
An element X forms a compound XH3 with hydrogen. Another element Y forms a compound YX2 with X. Given that the valency of hydrogen is 1, what are the valencies of X and Y?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>ORAL QUESTIONS>Q 4
Is the equation: Na + H2O → NaOH + H2 balanced? Why?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q A
Atoms of elements