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a
(a) →s, (b) →p,r (c) →s, (d) →p,r
b
(a) →s, (b) →p,s (c) →s, (d) →q,r
c
(a) →s, (b) →p,r (c) →s, (d) →q,r
d
(a) →p, (b) →p,r (c) →s, (d) →q,r
answer is C.
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Detailed Solution
Emission of one β particle leads to increase in atomic number by one and no change in mass number.Emission of one α particle leads to decrease in atomic number by two and decrease in mass number by four.