Question

If NA is Avogadro's number then number of valence
electrons in 3.2 g of oxide ions (02-) is
1.6 NA
0.8 NA
16 NA
8 NA​

Answer 1

Answer:

ans is 3.8

Explanation:

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Answer 2

Answer:

Number of moles =

14

4.2

=0.3 mol

0.3 mol =0.3×N

A

ions.

⇒8×0.3×N

A

electrons (as each ion contains 5+3=8e

−

)

⇒2.4N

A

electrons

Hence, the correct option is A.