SSC MTS EXAM

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SSC

CHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The atom around which the electrons spend the most time will have a ____ charge, and the atom around which the electrons spend the least time will have a ____ charge.
A
slightly negative, slightly positive
B
only positive charge
C
only negative charge
D
neutral charge
Explanation: 

Detailed explanation-1: -One atom with a somewhat higher electronegativity than the other. This will cause the electrons to be shared unevenly, such that the shared electrons will spend more time on average closer to the atom that has the higher electronegativity.

Detailed explanation-2: -The oxygen and hydrogen atoms share electrons, but since oxygen atom is more electronegative, which means it has a stronger pull on the electrons than hydrogen atoms, the electrons spend more time near the oxygen atom.

Detailed explanation-3: -In a polar covalent bond, the electrons shared by the atoms spend more time closer to one nucleus than to the other nucleus. Because of the unequal distribution of electrons between the different nuclei, a slightly positive (+) or slightly negative (–) charge develops.

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