Chemistry
Choose the correct option:
(a) The metal other than aluminum, which has a strong affinity for oxygen is:
(A) Copper
(B) Magnesium
(C) Silver
(D) Gold
(b) A metallic oxide which cannot be reduced by normal reducing agents:
(A) Zinc oxide
(B) Magnesium oxide
(C) Copper (II) oxide
(D) Iron (III) oxide
Metallurgy
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Answer
(a) Magnesium
Reason — Oxides of highly active metals like potassium, sodium, calcium, magnesium and aluminium have great affinity for oxygen
(b) Magnesium oxide
Reason — Oxides of highly active metals like potassium, sodium, calcium, magnesium and aluminium have great affinity for oxygen and so cannot be reduced by common reducing agents like carbon, carbon monoxide or hydrogen.
They are obtained by electrolytic reduction of fused metallic salts (halides and oxides) using inert electrodes.
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