Chemistry
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.
Metallurgy
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Answer
(a) does not react with dilute hydrochloric acid — Copper
(b) can form 2+ and 3+ ions — Iron
(c) arrange the above metals in the decreasing order of reactivity — Na > Mg > Zn > Fe > Cu
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