M is an element in the form of powder. M burns in oxygen and the product obtained is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences.

(a) If M is a metal, then the litmus will turn ……………

(b) If M is a non-metal, then the litmus will turn ……………

(c) If M is a reactive metal, then …………… will be evolved when M reacts with dilute sulphuric acid.

(d) If M is a metal, it will form …………… oxide, which will form …………… solution with water.

(e) If M is a non-metal, it will not conduct electricity unless it is in the form of ……………

(a) If M is a metal, then the litmus will turn blue

(b) If M is a non-metal, then the litmus will turn red

(c) If M is a reactive metal, then hydrogen gas will be evolved when M reacts with dilute sulphuric acid.

(d) If M is a metal, it will form basic oxide, which will form alkaline solution with water.

(e) If M is a non-metal, it will not conduct electricity unless it is in the form of graphite.

Explanation:

(a) Metal, M burns in oxygen to form an oxide. Metallic oxide forms an alkaline solution in water. Hence, turns red litmus blue.

(b) A non-metal on reacting with oxygen produces an acidic oxide. This acidic oxide will turn blue litmus paper blue.

(c) In Simple Displacement reaction, reactive metal and acid react to produce salt and hydrogen gas is evolved.

(d) Metals react with oxygen to form basic oxide which dissolve in water to give alkaline solution.

(e) In Graphite, each carbon atom is bonded to three other carbon atoms. Thus, one electron of carbon remains free. Due to this free valence electron, graphite is a good conductor of electricity. All other non-metals are poor conductors of electricity.