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PASSAGE - 3 : In modern periodic table t...

PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases.
The pair of elements with equal electro negativities

A

Na,K

B

N,Cl

C

O,S

D

F,C

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The correct Answer is:
B
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