Question

Which of the following name formula combinations is not correct ?

Formula	Name
(1) $K[Cr(NH_3)_2Cl_4]$ (III)	Potassium diammine Tetrachlorochromate
(2) $[CO(NH_3)_4(H_2OI)SO_4$	Tetraammine aquaiodo cobalt (III) sulphate
(3) $[Mn(CN)_5]^{2-}$	Pentacyanomagnate (II) ion
(4) $K_2[pt(CN)_4]$	Potassium tetracyanoplatinate(II)

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (C)

Correct Name of $\left[Mn \left(CN\right)_{5}\right]^{2-}$ is Pentacyanomagnate (III) ion.