EASY
9th Foundation
IMPORTANT
Earn 100

The atomic mass of oxygen is 16 and the molecular mass of ozone is 48. What is the atomicity of ozone, if it is an allotrope of oxygen?

50% studentsanswered this correctly

Important Questions on Atoms and Molecules

HARD
9th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 16
Two samples X and Y of a pure substance obtained by two different methods contain elements P and Q. Substance X has a mass of 2.25 g and contains 0.90 g of Q. Substance Y is made up of 60% P and 40% Q by weight. This is an illustration of
HARD
9th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 17

Which of the following represents the correct number of moles of each element in 40 g of ferric sulphate? [Atomic mass of Fe=56 u, S=32 u,O=16 u]

  Fe S O
(A) 2 3 12
(B) 1 1 4
(C) 0.2 0.3 1.2
(D) 0.1 0.1 0.4

 

HARD
9th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 18
Which of the following molecules contains highest number of particles?
HARD
9th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 19

The graphical representation of number of molecules of different gases is given. Which gases are placed at correct position?

Question Image

 

HARD
9th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 20
Sulphate of a divalent metal M exists in hydrated form. If 0.10 mol of metal sulphate combines with 9.0 g of water to form the hydrated salt then, the formula of metal sulphate will be