Complete the following by choosing the correct answers from the bracket:
(a) When dilute sulphuric acid reacts with zinc granules, the gas evolved is ............... (hydrogen / carbon dioxide), which can be tested using a burning splint.
(b) A solution of copper(II) sulphate in sodium hydroxide solution forms a ............... (pale blue / green) precipitate.
(c) In methane, each hydrogen atom share(s) ............... (one / two) electron(s) with the central carbon atom to complete its valence shell.
(d) The electron affinity of element X is greater than that of element Y. The oxidising power of X is likely to be ............... (more / less) than that of element Y.
(e) The naturally occurring compound of a metal from which the metal can be extracted is called its ............... (ore / mineral).
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(a) When dilute sulphuric acid reacts with zinc granules, the gas evolved is hydrogen, which can be tested using a burning splint.
(b) A solution of copper(II) sulphate in sodium hydroxide solution forms a pale blue precipitate.
(c) In methane, each hydrogen atom share one electron with the central carbon atom to complete its valence shell.
(d) The electron affinity of element X is greater than that of element Y.The oxidising power of X is likely to be more than that of element Y.
(e) The naturally occurring compound of a metal from which the metal can be extracted is called its ore.