Fill in the blanks:
$1.$ The copper layer on copper coins in the $UK$ is .......... .
$2.$ Copper-silver coins in the $UK$ are an alloy of ............ .
$3.$ The catalyst used for the oxidation of $SO_2$ to $SO_3$ is ......... .
$1.$ The copper layer on copper coins in the $UK$ is .......... .
$2.$ Copper-silver coins in the $UK$ are an alloy of ............ .
$3.$ The catalyst used for the oxidation of $SO_2$ to $SO_3$ is ......... .
(N/A) $1.$ The copper layer on copper coins in the $UK$ is $Cu$ (Copper).
$2.$ Copper-silver coins in the $UK$ are an alloy of $Cu$ and $Ag$.
$3.$ The catalyst used for the oxidation of $SO_2$ to $SO_3$ is $V_2O_5$ (Vanadium pentoxide).
$2.$ Copper-silver coins in the $UK$ are an alloy of $Cu$ and $Ag$.
$3.$ The catalyst used for the oxidation of $SO_2$ to $SO_3$ is $V_2O_5$ (Vanadium pentoxide).
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