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a

(p)→(iii); (q)→(iv); (r)→(i); (s)→(ii)

b

(p)→(iv); (q)→(iii); (r)→(ii); (s)→(i)

c

(p)→(iv); (q)→(iii); (r)→(i); (s)→(ii)

d

(p)→(iv); (q)→(i); (r)→(iii); (s)→(ii)

answer is C.

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Detailed Solution

Duma's method is used. to estimate the percentage of nitrogen displacement of air. In Carius method AgNO3 is used. to-estimate halogen precipitation as AgX. Carius method  BaCl2 for the precipitation sulphur as BaSO4. When the percentage of all elements of a compound is less than 100, the remaining part is oxygen
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