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Find the valency of the element from the following formula.
a. \(NaCl\) valency of \(Na\) is
b. \(CO_2\) valency of \(C\) is
c. \(Al(PO_4)\) valency of \(Al\) is
d. \(Ba(NO_3){_2}\) valency of \(Ba\) is
e. \(CaCl_2\) valency of \(Ca\) is
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