18) Cobalt-60 is produced by a three reaction process involving neutron capture,

Question

18) Cobalt-60 is produced by a three reaction process involving neutron capture, beta-emission, and neutron capture. The initial reactant in the production of cobalt-60 is A) 59Co B)56Fe C) 58Fe D) 61Co E) 60Fe 19) The half-life of a radionuclide . A) is constant B) gets shorter with passing time C) gets longer with passing time D) gets shorter with increased temperature E) gets longer with increased temperature 20) By what process does thorium-230 decay to radium-226? A) gamma emission B) alpha emission C) beta emission D) electron capture E) positron emission Part II 21. Balance the following oxidation-reduction reaction that occur in acidic solution using half- reaction method: Mn2(aq)+ NaBios(s) Bi3 (aq)+MnO4(aq)

Explanation / Answer

18)

Let the reactant be X

the reaction is:

X + 2 n —> Co + B

Balance mass number on both sides

mass of n + mass of X = mass of Co + mass of B

2*1 + M = 1*60 + 1*0

M = 58

Balance atomic number on both sides

atomic of n + atomic of X = atomic of Co + atomic of B

2*0 + A = 1*27 + 1*-1

A = 26

Atomic number 26 is for element Fe

So, the reactant is

58-Fe

Answer: C

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