Match List-I with List-II.

List-I (Ore)	List-II (Element Present)
(a) Kernite	(p) Tin
(b) Cassiterite	(q) Boron
(c) Calamine	(r) Fluorine
(d) Cryolite	(s) Zinc

Choose the most appropriate answer from the options given below:

We need to match each ore with the element it contains.

(a) Kernite has the chemical formula $$Na_2B_4O_7 \cdot 4H_2O$$. It is a hydrated sodium borate mineral, so the key element present is Boron (q).

(b) Cassiterite has the chemical formula $$SnO_2$$. It is the principal ore of tin, so the element present is Tin (p).

(c) Calamine has the chemical formula $$ZnCO_3$$. It is a zinc carbonate mineral, so the element present is Zinc (s).

(d) Cryolite has the chemical formula $$Na_3AlF_6$$. It contains both aluminium and fluorine, and among the given options, the element present is Fluorine (r).

Thus the correct matching is: (a)$$\to$$(q), (b)$$\to$$(p), (c)$$\to$$(s), (d)$$\to$$(r).

The correct answer is Option 4.