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 ……………

Select the word/s given below which are required to correctly complete the blanks — [ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt water] :

(i) A solution M turns blue litmus red, so it must contain (i) …………… ions ; another solution O turns red litmus blue and hence, must contain, (ii) …………… ions.

(ii) When solution M and O are mixed together, the prod­ucts will be (iii) …………… and (iv) …………… .

(iii) If a piece of magnesium was put into a solution M,(v) …………… gas would be evolved.

Match the salts given in column I with their method of preparation given in column II.

Match the salts given in column A to their methods of preparation in column B. Write a balanced equation for each preparation.