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An acidified solution of the salt KC1Ox (x = 1, 2 or 3) will oxidise Fe2(aq) to Fe3+(aq) quantitatively,
the chlorine being reduced to Cl-(aq).
When 0.150 g of the salt KClOx was reacted with 0.500 mol dm-3 Fe2+(aq) in the presence of H+ (aq),
11.3 cm3 of Fe2+(aq) was needed for complete reaction.
Calculate the value of x and construct an equation for the reaction between Fe2+(aq) and acidified
KCIO,
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b. is the answer hoped i        

catya your not at all which answer i've seen you do this on another question!

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.