Question

Find out the valency of the underlined elements:
i) Na2CO3 ii) SiO2 iii) CaCO3 iv) ZnSo4​

Answer 1

Answer:

The question is misconceived because salts don’t have a valency. It is the elements or compound elements in the salt that possess a valency, sometimes more than one. Within your question the valencies are simple with the Na ion being univalent and the CO3 ion bivalent. In general, the clue as to the valency of an element or radical ion is to note the number of atom or radical ions of the associated entity. Thus, in sodium carbonate, the CO3 (bivalent) is associated with 2 Na ions while the 2 sodium (monovalent) ions require a single carbonate ion.

Answer 2

Answer:

In mathematics, a polynomial is an expression consisting of variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponentiation of variables. An example of a polynomial of a single indeterminate x is x² − 4x + 7.