The elements listed are in order of decreasing reactivity: lithium, calcium, carbon, zinc, iron, hydrogen, copper, silver. Which element(s) …

1. amust be kept in paraffin? [1]
2. bhas a green carbonate which decomposes on heating to give a black solid? [1]
3. cis used in making steel? [1]
4. dforms ions that, when ammonia solution is added, give a white precipitate that re-dissolves on addition of more ammonia solution? [1]
5. eare components of brass? [1]
6. fform a hydroxide which decomposes by gentle heating? [2]
7. gcompletely reacts with oxygen to form an acidic oxide? [1]

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