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] :
(a) 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.
(b) When solution M and O are mixed together, the products will be (iii) ____ and (iv) ____
(c) If a piece of magnesium was put into a solution M,(v) ____ gas would be evolved.

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(a) A solultion M turns blue litmus red, so it must contain (i) hydronium ions ; another solution O turns red litmus blue and hence, must contain, (ii) hydroxide ions.
(b) When solution M and O are mixed together, the prod­ucts will be (iii) salt and (iv) water.
(c) If a piece of magnesium was put into a solution M, (v) hydrogen gas would be evolved.

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