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What is the formal charge on the $N$ atom in the $[S-C \equiv N:]^-$ ion?

Which of the following species has polar and non-polar bonds but the molecule as a whole is non-polar?

Identify the option$(s)$ which contain correct statements.

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In the $OF_2$ molecule,the number of bonding and lone pairs of electrons are,respectively,........

Match the scientists given in List-$I$ with their discoveries given in List-$II$.
List-$I$ List-$II$
$(1)$ Kossel and Lewis $(A)$ $VSEPR$
$(2)$ Langmuir $(B)$ Molecular Orbital Theory
$(3)$ Sidgwick and Powell $(C)$ Covalent Bond
$(4)$ Heitler and London $(D)$ Octet Rule
$(5)$ $F$. Hund and Mulliken $(E)$ Valence Bond Theory

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