Which of the following name formula combinations is not correct?
Show Hint
- \(\mathrm{K_2[Pt(CN)_4]}\) - Potassium tetracyanoplatinate (II)
- \(\mathrm{[Mn(CN)_5]^{2-}}\) - Pentacyanomagnate (II) ion
- \(\mathrm{K[Cr(NH_3)_2Cl_4]}\) - Potassium diammine tetrachlorochromate (III)
- \(\mathrm{[Co(NH_3)_4(H_2O)I]SO_4}\) - Magnetron value.
The Correct Option is B
Solution and Explanation
(2) \(\mathrm{[Mn(CN)_5]^{2-}}\): x + 5(-1) = -2, x = +3, so the metal is Mn(III), not Mn(II); the name (also spelt 'magnate' for manganate) is incorrect.
(3) \(\mathrm{K[Cr(NH_3)_2Cl_4]}\): +1 + x + 0 + 4(-1) = 0, x = +3; potassium diamminetetrachlorochromate(III) - correct.
(4) The intended name of \(\mathrm{[Co(NH_3)_4(H_2O)I]SO_4}\) is tetraammineaquaiodocobalt(III) sulphate (Co: x + 0 + 0 - 1 = +2, x = +3); the printed text of the option is garbled.
The designed incorrect combination is (2).
Answer: (2) \(\mathrm{[Mn(CN)_5]^{2-}}\) - Pentacyanomagnate (II) ion
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