Which of the following statements is not true?
a) when two nonmetals react, the compound formed is ionic.
b) two nonmetals can undergo an oxidation-reduction reaction.
c) a metal-nonmetal reaction can always be assumed to be an oxidation-reduction reaction.
d) a metal-nonmetal reaction involves electron transfer.
e) when a metal reacts with a nonmetal, an ionic compound is formed.

Answer : The incorrect statements are:

(A) When two nonmetals react, the compound formed is ionic.

(B) Two nonmetals can undergo an oxidation-reduction reaction.

Explanation :

Covalent compound : It is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound.

The covalent compound are usually formed when two non-metals react.

The two nonmetals can not undergo an oxidation-reduction reaction.

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

Ionic compound are usually formed when a metal reacts with a non-metal.

The metal-nonmetal reaction can always be assumed to be an oxidation-reduction reaction.

For example :

In this reaction, sodium shows oxidation because the oxidation state changes from (0) to (+1) and and chlorine shows reduction because the oxidation state changes from (0) to (-1).

Hence, the incorrect statements are, (A) and (B)

"the periodic table is arranged in order of atomic number."

c. 75.7

i think that is the right