State whether the following statement is true or false:
The atomicity of phosphorus is $5$ and that of sulphur is $6$.

You are provided with a fine white-coloured powder which is either sugar or salt. How would you identify it without tasting?

State whether the following statement is true or false:
$A$ mole always represents $6.023 \times 10^{22}$ atoms,molecules,or ions of a substance.

Compute the number of ions present in $5.85 \, g$ of sodium chloride.

The mass of one steel screw is $4.11 \, g$. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth $(5.98 \times 10^{24} \, kg)$. Which one of the two is heavier and by how many times?

Which amongst the following has a greater number of atoms,$11.5 \, g$ of sodium $(Na)$ or $15 \, g$ of calcium $(Ca)$? How? (Given: atomic mass of $Na = 23 \, u$,$Ca = 40 \, u$)