Chemistry
Why do gold ornaments look new even after several years of use?
Metallurgy
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Answer
As gold is less reactive, and do not react under normal conditions with oxygen, water, carbon dioxide and other reagents. Hence, it looks new and does not lose it's glitter and shine even after years.
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From the metals : copper, iron, magnesium, sodium and zinc, select a different metal in each case which :
(a) does not react with dilute hydrochloric acid,
(b) can form 2+ and 3+ ions,
(c) arrange the above metals in the decreasing order of reactivity.
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(b) a halide,
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Also give the names of their respective ores.