In oxidation there is increase in positive electrovalency or removal of an electropositive element . What is the difference between +ve electrovalency and electro +ve element?

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Q. Assertion :Conversion of potassium ferrocyanide to potassium is an oxidation process. Reason: Oxidation is the additon of oxygen / electronegative element to a substance or removal of hydrogen / electropositive element from a substance.

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be :

(a) P

(b) Q

(d) S

Q. Three elements X, Y and Z have atomic numbers 11, 12 and 17 respectively. Find the sum of their electrovalency.

Which of the following elements does not exhibit electrovalency ?

(a) calcium

(b) chromium

(d) cadmium

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