JAMB Chemistry Past Questions & Answers - Page 147

Some copper (ll) sulphate pentahydrate (CuSO₄ 5H₂O), was heated at 120 ^oC with the following results. Wt of crucible = 10.00 g; Wt of crucible + CuSO₄ 5H₂O =14.98g; Wt of crucible + residue = 13.54 g. How many molecules of water of crystalization were lost?

[H = 1, Cu = 63.5, O = 16, S = 32]

If an element has the electronic configuration 1s ² 2s² 2p³ 3s² 3p⁴, it is

Consecutive members of an alkane homologous serires differ by

The flame used by welders in cutting metals is

X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is