MEDIUM
9th CBSE
IMPORTANT
Earn 100

Which of the following correctly represents 360 g of water?
i 2 moles of H2O
ii 20 moles of water
iii 6.022×1023 molecules of water
iv 1.2044×1025 molecules of water

50% studentsanswered this correctly

Important Questions on Atoms and Molecules

MEDIUM
9th CBSE
IMPORTANT
If 32 g of sulphur has x atoms, then the number of atoms in 32 g of oxygen will be: 
MEDIUM
9th CBSE
IMPORTANT
A student wants to have 3.011×1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh:
HARD
9th CBSE
IMPORTANT
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be:
MEDIUM
9th CBSE
IMPORTANT
If 12 gram of carbon has x atoms, then the number of atoms in 12 grams of magnesium will be _____.
HARD
9th CBSE
IMPORTANT
Which of the following has the maximum number of atoms? 
HARD
9th CBSE
IMPORTANT

If 1 gram of sulphur dioxide contains x molecules, how many molecules will be present in 1 gram of oxygen? (S=32 u; O=16 u) 

MEDIUM
9th CBSE
IMPORTANT

The mass of one molecule of a substance is 4.65 x 10-23 g. What is its molecular mass? What could this substance be? 

HARD
9th CBSE
IMPORTANT

Which contains more molecules, 10g of sulphur dioxide (SO2) or 10g of oxygen (O2)? (Atomic masses: S=32u; O=16u