From the list given below, select the word(s) required to correctly complete blanb (I) to (v) in the following passage :
ammonia, ammonium carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water.
A solution X turns blue litmus red, so it must contain :
(i) ....................... ions, another solution Y turns red litmus blue and therefore, must contain (ii) . . . . . . . . . . .. . . . . . ions. When solutions X and Y are mixed together, the products will be a (iii) . . .. . . . . . . . and (iv) . . . . . . . . . . . . . . . . . . . . . If a piece of magnesium were put into solution X, (v) ...... ............. .. gas would be evolved. (Note : Words chosen from the list are to be used only once. Write the answers as (a) (i), (ii) (iii) and so on. Do not copy the passage.)