Một hạt nhân phóng xạ có thể phát ra hạt positron tức e+. Điều này tương ứng với một proton trong hạt nhân biến thành một neutron. Tuy nhiên khối lượng của neutron lại lớn hơn khối lượng của proton. Vậy làm thế nào để sự phát positron nói trên có thể xảy ra được?

answer: - first one is the correct answer. .

explanations: - potassium sulfide is and cobalt(ii) chloride is .

charge on k is +1, charge on s is -2, charge on co is +2 and charge on cl is -1.

in a double replacement reaction the ion exchange takes place. in general the reaction looks like:

if one of the product is insoluble as per solubility rules then a precipitate of it is formed.

when we mix the aqueous solutions of potassium sulfide and cobalt(ii) chloride then chloride ion goes with potassium ion and sulfide ion goes with cobalt ion and the balanced equation is written as:

k and cl has equal charges, similarly co and s has equal charges and hence no subscripts are used for the product side.

as per the solubility rules, cos is insoluble and so it's precipitate is formed.

looking at the given choices, first choice is correct.