For $AB$ bond,if percent ionic character is plotted against electronegativity difference $(X_A - X_B)$,the shape of the curve would look like. The correct curve is:

Given below are two statements:
Statement $I$: The correct order of electronegativity of fluorine, oxygen and nitrogen is $F > O > N$.
Statement $II$: The oxidation state of oxygen in $OF_2$ is $+2$ and in $Na_2O$ is $-2$.

An element which never has a positive oxidation number in any of its compounds is:

The correct order of electronegativities of $N$,$O$,$F$,and $P$ is

Identify the most electronegative element among the following.

Given below are two statements :
Statement $I$ : The electronegativity of group $14$ elements from $Si$ to $Pb$ gradually decreases.
Statement $II$ : Group $14$ contains non-metallic,metallic,as well as metalloid elements.
In the light of the above statements,choose the most appropriate from the options given below :