When NH GI is added to an aqueous solution of NH, OH, O Concentration of (NH4) ions decreases.
O Concentration of (NH, 4) ions increases.
No change will happen to the solution.
O Concentration of (OH) ions increases.
O Concentration of [Cl] ions decreases.

it's filtration, but this is an assumption so my apologies if i got this

answer: mole of the gas

answer: mole of the gasexplanation:

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.