Need help with chemistry question (1 Viewer)

[lazyandcool]

A non-metal element Z, forms a compound with the formula (NH4)2Z Which one of the following
would be a correct formula?
(A) NaZ
(B) Cu(II)Z
(C) MgZ2
(D) HZ

Could any1 know right answer for this 1?

 

[adomad]

B

 

[carmot]

B - Cu(II)Z

NH4 is ammonium ion, which has a charge of +1. Since the original formula was (NH4)2Z, we now know that Z has a charge of -2. Now just check the options to see which ones correspond to -2

A - Na is +1
B - correct
C - Mg is +2, however, there is Z2, so it does not balance out (+2/-4)
D - H is a charge of +/- 1

 

[lazyandcool]

thanks carmot

 

[t00l]

yup
copper(II) Z is right