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Metals are usually not found as nitrates in their ores. Out of the following two ($I$ and $II$) reasons,which is/are true for the above observation?
$I.$ Metal nitrates are highly unstable.
$II.$ Metal nitrates are highly soluble in water.

Which of the following is not a mineral of aluminium?

Match the following minerals in List-$I$ with their chemical formulas in List-$II$.
List-$I$List-$II$
$(A)$ Feldspar$(I)$ $[Ag_3SbS_3]$
$(B)$ Asbestos$(II)$ $Al_2O_3 \cdot H_2O$
$(C)$ Pyrargyrite$(III)$ $MgSO_4 \cdot H_2O$
$(D)$ Diaspore$(IV)$ $KAlSi_3O_8$
$(V)$ $CaMg_3(SiO_3)_4$

Which one of the following elements is most abundant in the earth's crust?

Match List-$I$ and List-$II$.
List-$I$ (Metal) List-$II$ (Ores)
$a$. Aluminium $i$. Siderite
$b$. Copper $ii$. Calamine
$c$. Iron $iii$. Kaolinite
$d$. Zinc $iv$. Malachite

Choose the correct answer from the options given below:

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