JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Consider the following metal complexes: \( [\mathrm{Co(NH_3)_6}]^{3+} \quad [\mathrm{CoCl(NH_3)_5}]^{2+} \quad [\mathrm{Co(CN)_6}]^{3-} \quad [\mathrm{Co(NH_3)_5(H_2O)}]^{3+} \) The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is ________ B.M. (Nearest integer)

\( [\mathrm{Fe(CN)_6}]^{4-} \)
\( [\mathrm{Fe(CN)_6}]^{3-} \)
\( [\mathrm{Ti(CN)_6}]^{3-} \)
\( [\mathrm{Ni(CN)_4}]^{2-} \)
\( [\mathrm{Co(CN)_6}]^{3-} \)
Among the given complexes, number of paramagnetic complexes is __________.

Given below are two statements:
Statement-I: \( \mathrm{[Ni(CN)_4]^{2-}} \) is square planar and diamagnetic complex, with \( \mathrm{dsp^2} \) hybridization for Ni but \( \mathrm{[Ni(CO)_4]} \) is tetrahedral, paramagnetic and with \( \mathrm{sp^3} \)-hybridization of Ni.
Statement-II: \( \mathrm{[NiCl_4]^{2-}} \) and \( \mathrm{[Ni(CO)_4]} \) both have same d-electron configuration, have same geometry and are paramagnetic.
In light of the above statements, choose the correct answer form the options given below:

The conductivity of a solution of complex with formula \( \mathrm{CoCl_3(NH_3)_4} \) corresponds to \( 1:1 \) electrolyte, then the primary valency of central metal ion is _______.

The major product \( (P) \) in the reaction

Sum of oxidation state (magnitude) and coordination number of cobalt in \( \text{Na[Co(bpy)Cl}_4] \) _______.

The difference between spin only magnetic moment values of \( [\text{Co(H}_2O)_6]\text{Cl}_2 \) and \( [\text{Cr(H}_2O)_6]\text{Cl}_3 \) is __________.

Given below are two statements.
Statement I: In \( \mathrm{CuSO_4 \cdot 5H_2O} \), Cu – O bonds are present.
Statement II: In \( \mathrm{CuSO_4 \cdot 5H_2O} \), ligands coordinating with \( \mathrm{Cu(II)} \) ion are O – and S – based ligands.
In the light of the above statement, choose the correct answer from the options given below:

\( (a) \\ \mathrm{CoCl_3 \cdot 4 \\ NH_3} \)
\( (b) \\ \mathrm{CoCl_3 \cdot 5NH_3} \)
\( (C) \\ \mathrm{CoCl_3 \cdot 6NH_3} \) and
\( (d) \\ \mathrm{CoCl(NO_3)_2 \cdot 5NH_3} \)
Number of complex(es) which will exist in cis-trans form is/are __________.

Among \( \mathrm{Co^{3+}} \), \( \mathrm{Ti^{2+}} \), \( \mathrm{V^{2+}} \) and \( \mathrm{Cr^{2+}} \) ions, one if used as a reagent cannot liberate \( \mathrm{H_2} \) from dilute mineral acid solution, its spin-only magnetic moment is gaseous state is ______ B.M. (Nearest integer)

Low oxidation state of metals in their complexes are common when ligands:

Spin only magnetic moment of \( [\text{MnBr}_6]^{4-} \) is ______ B.M. (round off nearest integer)

Reaction of \( [\text{Co}(\text{H}_2\text{O})_6]^{2+} \) with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in \( t_{2g} \)-orbitals of the product is ________.

Match List-I with List – II:

Given below are two Statements:
Statement I: Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.
Statement II: Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.
In the light of the above statements, choose the most appropriate answer from the options given below:

In the cobalt-carbonyl complex: \( [\mathrm{Co_2(CO)_8}] \), number of Co-co bonds is \( ''X'' \) and terminal CO ligands is \( ''Y'' \). \( X + Y = \) ____________.

Transition metal complex with highest value of crystal field splitting \( (\Delta_0) \) will be:

Amongst \( \mathrm{FeCl_3, \; 3H_2O, \; K_3[Fe(CN)_6]} \) and \( [\mathrm{Co(NH_3)_6}]\mathrm{Cl_3} \), the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wavelength is ___________ B.M. [nearest integer]

Leaching of gold with dilute aqueous solution of \( \mathrm{NaCN} \) in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are:

The correct order of energy of absorption for the following metal complexes is:
A : \( [\text{Ni}(\text{en})_3]^{2+} \) , B : \( [\text{Ni}(\text{NH}_3)_6]^{2+} \) , C : \( [\text{Ni}(\text{H}_2\text{O})_6]^{2+} \)

Total number of relatively more stable isomer(s) possible for octahedral complex \( [\mathrm{Cu(en)_2(SCN)_2}] \) will be ____________.

\( [\mathrm{Fe}(\mathrm{CN})_6]^{3-} \) should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is \( (-) \) __________ \( \Delta_0 \). (Nearest integer)

White precipitate of \( \mathrm{AgCl} \) dissolves in aqueous ammonia solution due to formation of :

Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: \( \mathrm{Mn} = 25 \); \( \mathrm{Fe} = 26 \))
A. \( [\mathrm{FeF}_{6}]^{3-} \)
B. \( [\mathrm{Fe(CN)}_{6}]^{3-} \)
C. \( [\mathrm{MnCl}_{6}]^{3-} \) (high spin)
D. \( [\mathrm{Mn(CN)}_{6}]^{3-} \)
Choose the correct answer from the options given below:

Octahedral complexes of copper \( (\mathrm{II}) \) undergo structural distortion (Jahn-Teller). Which one of the given copper \( (\mathrm{II}) \) complexes will show the maximum structural distortion? (en – ethylenediamine; \( \mathrm{H_2N - CH_2 - CH_2 - NH_2} \) )

For the reaction given below:
\( \text{CoCl}_3 \cdot x \text{NH}_3 + \text{AgNO}_3 \, (\text{aq}) \rightarrow \)
If \( 2 \) equivalents of \( \text{AgCl} \) precipitate out, then the value of \( x \) will be ______.

If \( [\mathrm{Cu(H_2O)_4}]^{2+} \) absorbs a light of wavelength \( 600 \, \text{nm} \) for d-d transition, then the value of octahedral crystal field splitting energy for \( [\mathrm{Cu(H_2O)_6}]^{2+} \) will be __________ \( \times 10^{-21} \, \text{J} \). (Nearest Integer)
[Given : \( h = 6.63 \times 10^{-34} \, \text{J s} \) and \( c = 3.08 \times 10^{8} \, \text{m s}^{-1} \) ]

Number of complexes which will exhibit synergic bonding amongst, \( [\mathrm{Cr}(\mathrm{CO})_6] \), \( [\mathrm{Mn}(\mathrm{CO})_5] \) and \( [\mathrm{Mn}_2(\mathrm{CO})_{10}] \) is ______.

The spin-only magnetic moment value of an octahedral complex among \( \mathrm{CoCl_3 \cdot 4NH_3} \), \( \mathrm{NiCl_2 \cdot 6H_2O} \) and \( \mathrm{PtCl_4 \cdot 2HCl} \), which upon reaction with excess of \( \mathrm{AgNO_3} \) gives \( 2 \) moles of \( \mathrm{AgCl} \) is ___________ B.M. (Nearest Integer)

← PreviousQuestion 4 of 29Next →

JEE Main 2022 27th July Morning Shift

The conductivity of a solution of complex with formula \( \mathrm{CoCl_3(NH_3)_4} \) corresponds to \( 1:1 \) electrolyte, then the primary valency of central metal ion is _______.