Elements and Compounds — CHEMISTRY STD 7 — Question
ICSE BoardEnglish MediumSTD 7CHEMISTRYElements and Compounds2 Marks
Question
What is the valency of copper in $–$
$a. CuSO_4$
$b. Cu_2O?$
✓
Answer
$(a)$ Since sulphate has a charge of $-2,$ copper would also have a charge/valency of $+2,$ i.e., $Cu(II).$
$(b)$ Since the valencies $/$ charges of atoms are interchanged while writing the formulae, valency of copper in $Cu_2O$ would be $+1,$ i.e. $Cu(I).$
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