JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The correct order of the number of unpaired electrons in the given complexes is \(A.\) \(\left[ Fe ( CN )_6\right]^{3-}\);\(B.\) \(\left[ FeF _6\right]^{3-}\); \(C.\) \(\left[ CoF _6\right]^{3-}\); \(D.\) \(\left[ Cr (\text { oxalate })_3\right]^{3-}\); \(E.\) \(\left[ Ni ( CO )_4\right]\) Choose the correct answer from the options given below:
- A \(A < E < D < C < B\)
- B \(E < A < D < C < B\)
- C \(E < A < B < D < C\)
- D \(A < E < C < B < D\)
Answer & Solution
Correct Answer
(B) \(E < A < D < C < B\)
Step-by-step Solution
Detailed explanation
\(A\). \(\left[ Fe ( CN )_6\right]^{3-} n =1\) \(B\). \(\left[ FeF _6\right]^{3-} n =5\) \(C\). \(\left[ CoF _6\right]^{3-} n =4\) \(D\). \(\left.[\text { Cr(oxalate })_3\right]^{3-} n =3\) \(E\). \(\left[ Ni ( CO )_4\right] n =0\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Statement \(I\) : Sodium hydride can be used as an oxidising agent. Statement \(II :\) The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below:JEE Mains 2021 Medium
- Choose the correct set of reagents for the following conversion trans \(\left( Ph - CH = CH - CH _3\right) \rightarrow\) cis \(\left( Ph - CH = CH - CH _3\right)\)JEE Mains 2023 Medium
- Below are two statements. One is labeled as Assertion \((\text A)\) and the other as Reason \((\text R)\).
Assertion \((\text A):\)\(\mathrm{H}_2 \mathrm{Te}\) is more acidic than \(\mathrm{H}_2 \mathrm{S}\).
Reason \((\text R):\) The bond dissociation enthalpy of \(\mathrm{H}_2 \mathrm{Te}\) is less than that of \(\mathrm{H}_2 \mathrm{S}\).
In the context of the above statements, choose the correct answer from the following options:JEE Mains 2024 Hard - The electrode potential of \(M ^{2+} / M\) of \(3 d-\) series elements shows positive value ofJEE Mains 2021 Easy
- The number of molecules which gives haloform test among the following molecules is \(.......\).
JEE Mains 2023 Hard - The reaction of cyanamide, \(NH _{2} CN _{( s )}\) with oxygen was run in a bomb calorimeter and \(\Delta U\) was found to be \(-742.24\, kJ\, mol ^{-1}\). The magnitude of \(\Delta H _{298}\) for the reaction \(NH _{2} CN _{( s )}+\frac{3}{2} O _{2}( g ) \rightarrow N _{2( g )}+ O _{2}( g )+ H _{2} O _{(l)}\) is ............ \(kJ\). (Rounded off to the nearest integer) [Assume ideal gases and \(\left. R =8.314\, J\, mol ^{-1} K ^{-1}\right]\)JEE Mains 2021 Easy
More PYQs from JEE Mains
- The formula of a gaseous hydrocarbon which requires \(6\) times of its own volume of \(O _{2}\) for complete oxidation and produces \(4\) times its own volume of \(CO _{2}\) is \(C _{ x } H _{ y }\). The value of \(y\) is ...... .JEE Mains 2021 Hard
- Let the set of all values of \(k \in \mathbb{R}\) such that the equation \(z(\bar{z} + 2 + i) + k(2 + 3i) = 0\), \(z \in \mathbb{C}\), has at least one solution, be the interval \([\alpha, \beta]\). Then \(9(\alpha + \beta)\) is equal to:JEE Mains 2026 Hard
- A capacitor P with capacitance \( 10\times10^{-6} F \) is fully charged with a potential difference of 6.0 V and disconnected from the battery. The charged capacitor P is connected across another capacitor Q with capacitance \( 20\times10^{-6} F \). The charge on capacitor Q when equilibrium is established will be \( \alpha\times10^{-5} C \).(assume capacitor \(Q\) does not have any charge initially),The value of \( \alpha \) is __________ .JEE Mains 2026 Hard
- Compound with molecular formula \(C _{3} H _{6} O\) can showJEE Mains 2021 Medium
- \(IUPAC\) name of following compound \((\mathrm{P})\) is
JEE Mains 2024 Hard - A solution of sodium sulphate contains \(92\, g\) of \(Na^+\) ions per kilogram of water. The Molality of \(Na^+\) ions in that solution in \(mol\, kg^{-1}\) isJEE Mains 2019 Hard