State whether the following statement is true or false:
The chemical formulae of cupric oxide and cuprous oxide are $CuO$ and $Cu_{2}O$ respectively.
The chemical formulae of cupric oxide and cuprous oxide are $CuO$ and $Cu_{2}O$ respectively.
(TRUE) The statement is True.
In cupric oxide,copper exhibits a valency of $+2$,and oxygen exhibits a valency of $-2$. By crossing the valencies,we get $Cu_{2}O_{2}$,which simplifies to $CuO$.
In cuprous oxide,copper exhibits a valency of $+1$,and oxygen exhibits a valency of $-2$. By crossing the valencies,we get $Cu_{2}O$.
In cupric oxide,copper exhibits a valency of $+2$,and oxygen exhibits a valency of $-2$. By crossing the valencies,we get $Cu_{2}O_{2}$,which simplifies to $CuO$.
In cuprous oxide,copper exhibits a valency of $+1$,and oxygen exhibits a valency of $-2$. By crossing the valencies,we get $Cu_{2}O$.
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Find the ratio by mass of the combining elements in the following compounds. (You may use Appendix $-III$)
$(a)$ $CaCO_{3}$ $(b)$ $MgCl_{2}$
$(c)$ $H_{2}SO_{4}$ $(d)$ $C_{2}H_{5}OH$
$(e)$ $NH_{3}$ $(f)$ $Ca(OH)_{2}$
$(a)$ $CaCO_{3}$ $(b)$ $MgCl_{2}$
$(c)$ $H_{2}SO_{4}$ $(d)$ $C_{2}H_{5}OH$
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$(b)$ Hydrogen and sulphur
$(c)$ Nitrogen and hydrogen
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$(e)$ Sodium and oxygen
$(f)$ Carbon and oxygen
$(a)$ Calcium and fluorine
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$(b)$ Carbon $c$
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$(c)$ $NH_{4}Cl$
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