Question

Stock notation is used to name compounds of metals which involve variable oxidation states.
(A) True
(B) False

Answer 1

Hint : In basic words, the oxidation number is the number assigned to the components in a chemical combination. The oxidation number is the total number of electrons that atoms in a molecule can share, lose, or acquire while establishing chemical interactions with atoms of another element.

Complete Step By Step Answer:
Stock notation is the way of describing the oxidation number of a metal using Roman numerals I, II, III, and so on inside parentheses. The Stock nomenclature for inorganic compounds is a widely used chemical nomenclature system created by German scientist Alfred Stock and originally published in 1919. The oxidation states of some or all of the elements in a compound are represented in parenthesis by Roman numerals in the "Stock system." There is no space between the end of the element name and the opening parenthesis in contrast to the standard English form for parentheses: for AgF, the correct form is "silver(I) fluoride," not "silver (I) fluoride." It is not required to express the oxidation state of an element in a compound with Roman numerals when there is no ambiguity: therefore, sodium chloride would be sufficient; sodium(I) chloride(I) is excessively lengthy and such usage is relatively unusual. As an illustration
Iron(II) chloride ( $FeC{l_2}$ )
Iron(III) chloride ( $FeC{l_3}$ )
Hence option A is correct.

Note :
The oxidation state of an atom has nothing to do with its "real" formal charge or any other atomic attribute. This is especially true at high oxidation states, when the ionisation energy necessary to form a multiply positive ion exceeds the energies available in chemical processes. Furthermore, depending on the electronegativity scale employed in their computation, the oxidation states of atoms in a particular molecule may differ. As a result, an atom's oxidation state in a compound is entirely a formalism.