2.
A change in the physical state can be brought about:
4.
Mass of one atom of oxygen is:
8.
Which of the following would weigh the highest?
9.
Which of the following contains maximum number of molecules?
12.
What is the symbol of helium?
13.
Which of the following statement is not true about an atom?
15.
What is the symbol of cobalt?
16.
What is the mass of 0.5 mole of water molecules?
23.
The chemical symbol for nitrogen gas is:
24.
Which of the following has maximum number of atoms?
26.
What is the mass of 1 mole of nitrogen atoms.
27.
A change in the physical state can be brought about:
28.
The chemical symbol for sodium is:
29.
Calculate the mass of 0.5 mole of N atoms