Atoms and Molec...

Which postulate of Dalton’s atomic theory is the basis of the law of conservation of mass?

Match the following with the correct response:

Which of the following is/are anion(s)?
(a) Magnesium
(b) Sulphate
(c) Oxalate
(d) Ammonium

What is the ratio of magnesium and sulphur by mass in magnesium sulphide?

Calculate the formula unit mass of ZnCl₂?

“Gram atomic mass of an element and the gram molecular mass of a compound contains the same number of molecules”. This is a _________.

Which of the two statements is true?

Statement A : X – rays are electromagnetic waves of very short wavelength.
Statement B : The maximum number of electrons that can be accommodated in L shell is 8.

Sample of water from a well is analysed. What will be the ratio of hydrogen and oxygen in it by mass?

Identify the incorrect statement(s).

Which of the two statement(s) is/are true?

Statement A : Atomic mass of an element is not its actual mass but relative mass.
Statement B : With the help of STM, it is possible to take the photograph of some atoms.