Dr. S P Jauhar and R Jauhar Solutions for Chapter: Atoms and Molecules, Exercise 1: Revision Exercise

What is the mass of $1$ atom of sulphur?

Which of the following is a tetra-atomic molecule?

$$\begin{gathered} \mathrm{A}) {\mathrm{CH}}_3\mathrm{OH} \\ \mathrm{B}) {\mathrm{CH}}_4 \\ \mathrm{C}) {\mathrm{H}}_2{\mathrm{O}}_2 \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

What is atomic mass unit?

What is the ratio by mass of nitrogen and hydrogen in ammonia?

Give two examples of trivalent metal ions.

What is the chemical formula of calcium oxide?

What is the molar mass of sulphur molecule $\left({\mathrm{S}}_8\right)$?

Correct the following symbols and formulae of elements and compounds.

Lead: $\mathrm{PB}$; Mercury: $\mathrm{Me}$;

Water: ${\mathrm{H}}_2{\mathrm{O}}_2$; Ammonia: ${\mathrm{HN}}_3$