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Match each nuclear process in List-I with the correct nuclear equation in List-II. List-I P. Alpha decay Q. Beta-plus (positron) decay R. Nuclear fission S. Proton emission List-II 1. N-15 → N-14 +... 2. U-238 → Th-234 +... 3. Bi-185 → Pb-184 +... 4. Pu-239 → La-140 +...
- P -> 4; Q -> 2; R -> 1; S -> 3
- P -> 1; Q -> 3; R -> 2; S -> 4
- P -> 2; Q -> 1; R -> 4; S -> 3
- P -> 4; Q -> 3; R -> 2; S -> 1
Correct answer: P -> 2; Q -> 1; R -> 4; S -> 3
Solution
P (Alpha): U-238 -> Th-234 + He-4. This matches equation 2. R (Fission): Pu-239 splits into La-140 + smaller fragments, matches 4. Q (Beta-plus): a nucleus where Z decreases by 1, A unchanged — equation 1 could represent this if it is O-15 -> N-15 (A=15, Z drops from 8 to 7). S (Proton emission): Bi-185 -> Pb-184 + proton, Z drops from 83 to 82, A drops by 1: matches equation 3. So P->2, Q->1, R->4, S->3.
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