4. Which of the following exhibit variable valency?
(a) Carbon
(c) Copper
(b) Calcium
(d) Chlorine
Answers
Answer:
copper
Explanation:
Copper shows variable valency as it is a d block element.
Thus, copper forms compounds containing Cu
+
ions or Cu
++
ions. Representative elements sodium, calcium and magnesium shows +1, +2 and +2 oxidation states respectively.
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Answer:
c) Copper
Explanation:
Valency is the number of electron requires to achieve a stable octet configuration. If the last shell contains electrons more than 4, it accepts electron otherwise it loses electron for stability.
Valency can be calculated from electronic configurations.
Normally, metals donate electrons from their valence shell to form positively charged ions. But when few metals lose electrons from the shell inner to the valence shell, then in such a case, variable valency is exhibited by such elements.
Such metals are transition metals such as Fe, Cu, Co, Ni.
Now, from the given options, only copper (Cu) is a transition metal that shows two valency +1 and +2.
Hence, the correct option is c) Copper.
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