JEE Main 2014 · 11 Apr · Shift 1 · Chemistry Q48

← JEE Main 2014 · 11 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 48 of 90

Which of the following name formula combinations is not correct ?

\ce{K2[Pt(CN)4]}

: Potassium tetracyanoplatinate (II)

\ce{[Mn(CN)5]^2-}

: Pentacyanomagnate (II) ion

\ce{K[Cr(NH3)2Cl4]}

: Potassium diammine tetrachlorochromate (III)

\ce{[Co(NH3)4(H2O)I]SO4}

: Tetraammine aquaiodo cobalt (III) sulphate

Answer and worked solution

Official answer: B

In $\ce{[Mn(CN)5]^2-}$ manganese is +3, and the anion name is "manganate". The correct name is pentacyanomanganate(III) ion, so "Pentacyanomagnate (II)" is wrong.

Topics:Nomenclature

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JEE Main 2014 · 11 Apr · Shift 1, Chemistry question 48