Need help with 37 38 and 39 The ground state electron configuration of Fe^3+ ion

Question

Need help with 37 38 and 39

The ground state electron configuration of Fe^3+ ion is_12s_2 2P_^6 3p^f3d^6. Therefore Fe^3+is: (a) diamagnetic (b) paramagnotic with 1 unpaired electron (c) paramagnetic with 3 unpaired electrons (d) paranagnetic with 4 unpaired electrons (e) paranagnetic with 5 unpaired electrons 38 The formula mass of A(CIO_2) is: (a) 555 (b) 411 (c) 155 (d) 277 (e 351) 39. The correct name for Ba'(NO_2)_2 is; (a) Barlum nitrade (b) Barlum nitrate (c) Barlum nitrate (d) Barlum dinitrale (e) Barlum dintrale

Explanation / Answer

37) The compound is paramagnetic with 5 unpaired electrons since it has 3d5 configuration

Hence the correct answer is Option E

38) Molar mass of Al(ClO3)3

=> 27 + 3(35.5 + 48)

=> 27 + 3(83.5)

=> 277

Hence the correct answer is Option D

39) Formula for Ba(NO2)2 is Barium nitrite

Hence the correct answer is Option A

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