Question

From the list given below, select the word(s) required to correctly complete blanks (i) to (v) in the following passage. The words from the list are to be used only once. Write the answers as (a) (i), (ii), (ii) and so on.

Do not copy the passage.

Ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water

1. 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.
2. When solutions M and O are mixed together, the products will be (iii) ______ and (iv) ______.
3. If a piece of magnesium was put into a solution M. (v) ______ gas would be evolved.

Answer 1

1. (i) hydronium
   (ii) hydroxide
2. (iii) salt
   (iv) water
3. (v) hydrogen