Problem

Direction (Q. Nos. 21-23) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct. Match the reactions given in Column I with their types in Column II.

	Column I		Column II
i.	$\text{N}_2 + \text{O}_2 \rightarrow 2\text{NO}$	p.	Neutralisation
ii.	$\text{Pb}(\text{NO}_3)_2 \rightarrow \text{PbO} + 2\text{NO}_2 + 0.5\text{O}_2$	q.	Disproportionation redox
iii.	$\text{NaH} + \text{H}_2\text{O} \rightarrow \text{NaOH} + \text{H}_2$	r.	Displacement redox
iv.	$2\text{NO}_2 + 2\text{OH}^- \rightarrow \text{NO}_2^- + \text{NO}_3^- + \text{H}_2\text{O}$	s.	Decomposition redox
v.	$\text{S}_8 + 12\text{OH}^- \rightarrow 4\text{S}^{2-} + 2\text{S}_2\text{O}_3^{2-} + 6\text{H}_2\text{O}$	t.	Combination redox

Codes

	i	ii	iii	iv	v
a.	p	q	r	s	t
b.	s	p	q	r	t
c.	r	s	p	q	t
d.	t	s	r	q	q

a. i-p, ii-q, iii-r, iv-s, v-t b. i-s, ii-p, iii-q, iv-r, v-t c. i-r, ii-s, iii-p, iv-q, v-t d. i-t, ii-s, iii-r, iv-q, v-q

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