Transition Elements — Part 1 MCQs with Explanations

Option A: $${\text{CrO}}_4^{2 - }$$ This is chromate ion, which is a moderately strong oxidizing agent. It can oxidize certain metals and compounds but is not as strong as some other options. Option B: $${\text{VO}}_4^{3 - }$$ This is peroxyvanadate ion, which is a strong oxidizing agent. It contains vanadium in its highest oxidation state, +5, and it has a high affinity for gaining electrons, making it a potent oxidizing agent. Option C: $${\text{FeO}}_4^{2 - }$$ This is ferrate ion, which is also a strong oxidizing agent. It contains iron in its highest oxidation state, +6, and it can oxidize a wide range of substances. Option D: $${\text{MnO}}_4^{2 - }$$ This is permanganate ion, which is a powerful oxidizing agent. It contains manganese in its highest oxidation state, +7, and it is commonly used in various oxidation reactions, such as in the laboratory and in water treatment processes. So, to correct the record, Option D, $${\text{MnO}}_4^{2 - }$$

Lu3+, Yb3+, Dy3+, Eu3+ is the correct answer to “The separation of trivalent lanthanide ions, Lu 3+ , Yb 3+ , Dy 3+ , Eu 3+ can, be effectively done by a cation exchange resin using ammonium o-hydroxy iso-butyrate as the eluent. The order in which the ions will be separated is”. This question is standard in competitive examination syllabi for Transition Elements.

Td and (C2v and D4h) is the correct answer to “[CoCl 4 ] 2- is a blue coloured complex. Controlled-treatment of this complex with water generates two isomeric light pink coloured complexes of composition [Ca(H 2 O) 4 Cl 2 ]. Identify the correct point groups far [CoCl 4 ] 2- and two isomeric complexes [CO(H 2 O) 4 Cl 2 ].”. This question is standard in competitive examination syllabi for Transition Elements.

[Co(H2NCH2CH2NH2)3]3+ is the correct answer to “The complex that exists as a pair of enantiomers is”. This question is standard in competitive examination syllabi for Transition Elements.

[Fe(H2O)5NO]2+ is the correct answer to “The complex formed in the brown ring test for nitrates is”. This question is standard in competitive examination syllabi for Transition Elements.

f-orbital, compared to d-orbital interact less effectively with ligand is the correct answer to “The ligand field bands of lanthanide complexes are generally sharper than those of transition metal complexes because”. This question is standard in competitive examination syllabi for Transition Elements.

3 and 6 is the correct answer to “The total number of metal-metal bonds in Ru 3 (CO) 12 and Co 4 (CO) 12 respectively is”. This question is standard in competitive examination syllabi for Transition Elements.

Eu3+ is the correct answer to “The difference in the measured and calculated magnetic moment (based on spin-orbit coupling) is observed for”. This question is standard in competitive examination syllabi for Transition Elements.

ionization isomerism is the correct answer to “The comlexes [Co(NH 3 ) 4 (H 2 O)Cl]Br 2 and [Co(NH 3 )Br 2 ]Cl $$ \cdot $$ H 2 O are examples of”. This question is standard in competitive examination syllabi for Transition Elements.

Cr(CO)6 is the correct answer to “The compound which obeys 18-electron rule is”. This question is standard in competitive examination syllabi for Transition Elements.

there exists no direct relation between these two phenomenon is the correct answer to “The correct statement regarding the thermodynamic stability and kinetic reactivity of metal ion complexes is that”. This question is standard in competitive examination syllabi for Transition Elements.

the axial bonds are longer than the equatorial ones is the correct answer to “The correct statement about the Cu-N bond distances in [Cu(NH 3 ) 6 ] 2+ is”. This question is standard in competitive examination syllabi for Transition Elements.

chlorophyll is the correct answer to “A well known naturally occurring organometallic compound is”. This question is standard in competitive examination syllabi for Transition Elements.

(CO)5 W=C(Me)OMe is the correct answer to “W(CO) 6 reacts with MeLi to give an intermediate which upon treatment with CH 2 N 2 gives a compound X, X is represented as”. This question is standard in competitive examination syllabi for Transition Elements.

Zn is the correct answer to “The metal ion present in carbonic anhydrase is”. This question is standard in competitive examination syllabi for Transition Elements.

d-d transition is the correct answer to “The red colour of oxyhaemoglobin is mainly due to the”. This question is standard in competitive examination syllabi for Transition Elements.

[Mn(H2O)6]3+ is the correct answer to “The compound which exhibits John-Teller distortion is”. This question is standard in competitive examination syllabi for Transition Elements.

0 and 1 is the correct answer to “The number of absorption bands observed in [FeF 6 ] 3- and [CoF 6 ] 3- , respectively are”. This question is standard in competitive examination syllabi for Transition Elements.

zinc is the correct answer to “The metal present at the active site of the protein carboxypeptidase A is”. This question is standard in competitive examination syllabi for Transition Elements.

Fe2+ in the low spin state changes to Fe2+ in the high spin state is the correct answer to “In the transformation of oxyhaemoglobin to deoxyhaemoglobin”. This question is standard in competitive examination syllabi for Transition Elements.

(η5 - C5H5)Re(η6 - C6H6) is the correct answer to “The neutral complex which follows the 18-electron rule is”. This question is standard in competitive examination syllabi for Transition Elements.

Fe and Zn is the correct answer to “Among the following pair of metal ions present in nature, the first one functions as an electron transfer agent and the second one catalyzes the hydrolysis reactions. The correct pair is”. This question is standard in competitive examination syllabi for Transition Elements.

remove an electronic degeneracy is the correct answer to “John-Teller distortion of CuSO 4 · 5H 2 O acts to”. This question is standard in competitive examination syllabi for Transition Elements.

dichloro diglycinato cobalt (III) is the correct answer to “The octahedral complex/complex ion which shows both facial and meridional isomers is”. This question is standard in competitive examination syllabi for Transition Elements.

P < S < Q < R is the correct answer to “Arrange the following metal complexes in order of their increasing hydration energy [Mn(H 2 O) 6 ] 2+ [V(H 2 O) 6 ] 2+ [Ni(H 2 O) 6 ] 2+ [Ti(H 2 O) 6 ] 2+ P Q R S”. This question is standard in competitive examination syllabi for Transition Elements.

(iii) > (ii) > (i) is the correct answer to “The values of M-C stretching frequencies of (i) [V(CO) 6 ] - ; (ii) [Cr(CO) 6 ] and (iii) [Mn(CO) 6 ] + follow the trend”. This question is standard in competitive examination syllabi for Transition Elements.

ionization isomerism is the correct answer to “The complexes [Co(NH 3 ) 4 (H 2 O)Cl]Br 2 and [Co(NH 3 ) 4 Br 2 ]Cl · H 2 O are examples of”. This question is standard in competitive examination syllabi for Transition Elements.

zero unpaired electrons is the correct answer to “The magnetic moment of [Ru(H 2 O) 6 ] 2+ corresponds to the presence of”. This question is standard in competitive examination syllabi for Transition Elements.

[Re2Cl8]2- is the correct answer to “The compound which has four metal-metal blonds is”. This question is standard in competitive examination syllabi for Transition Elements.

iv < i < iii < ii is the correct answer to “The increasing order of wavelength of absorption for the complex ions i. [Cr(NH 3 ) 6 ] 3+ ii. [CrCl 6 ] 3- iii. [Cr(OH 2 ) 6 ] 3+ iv. [Cr(CN) 6 ] 3- is”. This question is standard in competitive examination syllabi for Transition Elements.

stronger than that of [MnCl4]2- is the correct answer to “The absorption of [Co(NH 3 ) 6 ] 2+ is”. This question is standard in competitive examination syllabi for Transition Elements.

[PtCl4]2- with PPh3 followed by the reaction with NH3 is the correct answer to “The most suitable route to prepare the trans isomer of [PtCl 2 (NH 3 )(PPh 3 )] is”. This question is standard in competitive examination syllabi for Transition Elements.

[PdCl4]2- is the correct answer to “The catalyst used in the conversion of ethylene to acetaldehyde using Wacker process is”. This question is standard in competitive examination syllabi for Transition Elements.

3 is the correct answer to “The number of unpaired electron (s) present in the species [Fe(H 2 O) 5 (NO)] 2+ which is formed during brown ring test is”. This question is standard in competitive examination syllabi for Transition Elements.

electron transfer is the correct answer to “Iron-sulphur clusters in biological systems are involved in”. This question is standard in competitive examination syllabi for Transition Elements.

[Mn(CO)5]-, [CH3C(O)Mn(CO)5] is the correct answer to “In the reaction shown below, X and Y respectively are \[M{n_2}{\left( {CO} \right)_{10}}\xrightarrow{{\,\,\,Na\,\,\,}}\left( X \right)\xrightarrow{{C{H_3}CoCl}}\left( Y \right)\]”. This question is standard in competitive examination syllabi for Transition Elements.

dynamic John-Teller distortion is the correct answer to “The d-d absorption band of [Fe(H 2 O) 6 ] 2+ is split due to”. This question is standard in competitive examination syllabi for Transition Elements.

Re is the correct answer to “Metal-metal quadruple bonds are well known for the metal”. This question is standard in competitive examination syllabi for Transition Elements.

square planar and tetrahedral is the correct answer to “The structures of the complexes [Cu(NH 3 ) 4 ] (ClO 4 ) 2 and [Cu(NH 3 ) 4 ] (ClO 4 ) in the solution respectively are”. This question is standard in competitive examination syllabi for Transition Elements.

20325 cm-1 is the correct answer to “The crystal field stabilization energy (CFSE) value for [Ti(H 2 O) 6 ] 3+ that has an absorption maximum at 492 nm is”. This question is standard in competitive examination syllabi for Transition Elements.