Which is the correct set of carbonate ores?
$(a)$ Magnesite $(b)$ Siderite $(c)$ Zincite $(d)$ Argentite

Cinnabar is the ore of

Which one of the following is an ore of silver?

$ACl_2$ (excess) + $BCl_2$ $\rightarrow$ $ACl_4$ + $B \downarrow$
$BO \xrightarrow[\Delta]{> 400 \ ^oC} \frac{1}{2} O_2 + B$
If $A$ and $B$ are metals,then the ore of $B$ would be:

The most abundant element on the Earth's crust is

Which of the following ores does not represent an ore of iron?