Draw the electron dot structure for the following

(a) Hydronium ion

(b) Methane

Distinguish between the following as directed.

(a) Ammonium chloride and sodium chloride on the basis of heating

(b) Ferric salt and ferrous salt by using ammonium hydroxide

With reference to the first three periods of the modern periodic table, answer the questions given below.

(a) What features of the atomic structure accounts for the similarities in the chemical properties of the elements in group VII A of the periodic table?

(b) Name the element which has the highest ionisation potential.

(c) What is the atomic number and name of the element present in 3rd period and 17th group of the periodic table?

The following questions are pertaining to various laboratory preparations

(a) Which property of hydrogen chloride is demonstrated by fountain experiment?

(b) Why hydrogen chloride gas is not collected over water?

(c) What is the source of nitrogen gas used in Haber's process?