JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Given below are two statements:
Statement (I) : A solution of \( [\mathrm{Ni}(\mathrm{H_2O})_6]^{2+} \) is green in colour.
Statement (II) : A solution of \( [\mathrm{Ni}(\mathrm{CN})_4]^{2-} \) is colourless.
In the light of the above statements, choose the most appropriate answer from the options given below:

An octahedral complex with the formula \( \mathrm{CoCl_3} \cdot n\mathrm{NH_3} \) upon reaction with excess of \( \mathrm{AgNO_3} \) solution gives \( 2 \, \text{moles} \) of \( \mathrm{AgCl} \). Consider the oxidation state of Co in the complex is ‘\( x \)’. The value of ‘‘\( x + n \)’’ is ______.

Number of ambidentate ligands among the following is _______.
\( \mathrm{NO_2^-} \), \( \mathrm{SCN^-} \), \( \mathrm{C_2O_4^{2-}} \), \( \mathrm{NH_3} \), \( \mathrm{CN^-} \), \( \mathrm{SO_4^{2-}} \), \( \mathrm{H_2O} \).

Match List – I with List – II

List I (Complex ion)	List – II (Spin only magnetic moment in B.M.)
(A) \( [\mathrm{Cr(NH_3)_6}]^{3+} \)	(I) \( 4.90 \)
(B) \( [\mathrm{NiCl_4}]^{2-} \)	(II) \( 3.87 \)
(C) \( [\mathrm{CoF_6}]^{3-} \)	(III) \( 0.0 \)
(D) \( [\mathrm{Ni(CN)_4}]^{2-} \)	(IV) \( 2.83 \)

Choose the correct answer from the options given below :

The coordination geometry around the manganese in decacarbonyldimanganese \( (0) \) is:

Number of complexes from the following with even number of unpaired “\( d \)” electrons is ______.
\( [\mathrm{V}(\mathrm{H_2O})_6]^{3+};\ [\mathrm{Cr}(\mathrm{H_2O})_6]^{2+};\ [\mathrm{Fe}(\mathrm{H_2O})_6]^{3+};\ [\mathrm{Ni}(\mathrm{H_2O})_6]^{3+};\ [\mathrm{Cu}(\mathrm{H_2O})_6]^{2+} \)
[Given atomic numbers : \( \mathrm{V}=23 \), \( \mathrm{Cr}=24 \), \( \mathrm{Fe}=26 \), \( \mathrm{Ni}=28 \), \( \mathrm{Cu}=29 \)]

The spin only magnetic moment value of square planar complex \( [\mathrm{Pt}(\mathrm{NH}_3)_2\mathrm{Cl(NH_2CH_3})]\mathrm{Cl} \) is __________ B.M (Nearest integer)
(Given atomic number for Pt = \( 78 \))

The number of unpaired \( d \)-electrons in \( [\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6]^{3+} \) is __________.

Identify from the following species in which \( d^2sp^3 \) hybridization is shown by central atom:

10.

Consider the following complexes \( [\mathrm{CoCl(NH_3)_5}]^{2+} \), \( [\mathrm{Co(CN)_6}]^{3-} \), \( [\mathrm{Co(NH_3)_5(H_2O)}]^{3+} \), \( [\mathrm{Cu(H_2O)_4}]^{2+} \).
The correct order of \( A \), \( B \), \( C \) and \( D \) in terms of wavenumber of light absorbed is:

11.

The number of complexes from the following with no electrons in the \( t_2 \) orbital is ________.
\( \mathrm{TiCl_4, [ MnO_4]^{-}, [ FeO_4]^{2-}, [ FeCl_4]^{-}, [ CoCl_4]^{2-}} \)

12.

The correct IUPAC name of \( [\mathrm{PtBr}_2(\mathrm{PMe}_3)_2] \) is:

13.

\( [\mathrm{Co(NH_3)_6}]^{3+} \) and \( [\mathrm{CoF_6}]^{3-} \) are respectively known as:

14.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The total number of geometrical isomers shown by \( [\text{Co(en)}_2 \text{Cl}_2]^+ \) complex ion is three.
Reason (R): \( [\text{Co(en)}_2 \text{Cl}_2]^+ \) complex ion has an octahedral geometry.
In the light of the above statements, choose the most appropriate answer from the options given below:

15.

Number of complexes with even number of electrons in \( t_{2g} \) orbitals is:
\( [\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6]^{2+} \), \( [\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6]^{2+} \), \( [\mathrm{Co}(\mathrm{H}_2\mathrm{O})_6]^{3+} \), \( [\mathrm{Cu}(\mathrm{H}_2\mathrm{O})_6]^{2+} \), \( [\mathrm{Cr}(\mathrm{H}_2\mathrm{O})_6]^{2+} \)

16.

The ‘Spin only’ Magnetic moment for \( [\text{Ni(NH}_3\text{)}_6]^{2+} \) is ______ \( \times 10^{-1} \, \text{BM} \).
(given = Atomic number of Ni : \( 28 \))

17.

The correct statements from following are:
A. The strength of anionic ligands can be explained by crystal field theory.
B. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds.
C. The hybridization involved in formation of \( \mathrm{[Ni(CN)_4]^{2-}} \) complex is \( dsp^2 \).
D. The number of possible isomer(s) of cis-\( \mathrm{[PtCl_2(en)_2]^{2+}} \) is \( one \).
Choose the correct answer from the options given below:

18.

Number of complexes which show optical isomerism among the following is _______.
\( \text{cis-}[\mathrm{Cr(ox)_2Cl_2}]^{3-},\ [\mathrm{Co(en)_3}]^{3+},\ \text{cis-}[\mathrm{Pt(en)_2Cl_2}]^{2+},\ \text{cis-}[\mathrm{Co(en)_2Cl_2}]^{+},\ \text{trans-}[\mathrm{Pt(en)_2Cl_2}]^{2+},\ \text{trans-}[\mathrm{Cr(ox)_2Cl_2}]^{3-} \)

19.

Given below are two statements:
Statement-I: \( \mathrm{N}(\mathrm{CH}_3)_3 \) and \( \mathrm{P}(\mathrm{CH}_3)_3 \) can act as ligands to form transition metal complexes.
Statement-II: As \( \mathrm{N} \) and \( \mathrm{P} \) are from same group, the nature of bonding of \( \mathrm{N}(\mathrm{CH}_3)_3 \) and \( \mathrm{P}(\mathrm{CH}_3)_3 \) is always same with transition metals.
In the light of the above statements, choose the most appropriate answer from the options given below:

20.

Which of the following complex is homoleptic?

21.

The metal atom present in the complex \( \mathrm{MABXL} \) (where \( A \), \( B \), \( X \) and \( L \) are unidentate ligands and \( M \) is metal) involves \( \mathrm{sp^3} \) hybridization. The number of geometrical isomers exhibited by the complex is:

22.

Given below are two statements:
Statement (I): Dimethyl glyoxime forms a six-membered covalent chelate when treated with \( \mathrm{NiCl_2} \) solution in presence of \( \mathrm{NH_4OH} \).
Statement (II): Prussian blue precipitate contains ion both in \( (+2) \) and \( (+3) \) oxidation states.
In the light of the above statements, choose the most appropriate answer from the options given below:

23.

Given below are two statements:
Statement I: \( \mathrm{PF}_{5} \) and \( \mathrm{BrF}_{5} \) both exhibit \( \mathrm{sp}^{3}\mathrm{d} \) hybridization.
Statement II: Both \( \mathrm{SF}_{6} \) and \( [\mathrm{Co}(\mathrm{NH}_{3})_{6}]^{3+} \) exhibit \( \mathrm{sp}^{3}\mathrm{d}^{2} \) hybridization.
In the light of the above statements, choose the correct answer from the options given below:

24.

Match List-I with List-II.

Choose the correct answer from the options given below:

25.

The coordination environment of \( \mathrm{Ca^{2+}} \) ion in its complex with \( \mathrm{EDTA^{4-}} \) is:

26.

The correct IUPAC name of \( K_2MnO_4 \) is:

27.

In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

28.

Match List I with List II

List I (Complex ion)	List II (Electronic Configuration)
A. \( [\mathrm{Cr(H_2O)_6}]^{3+} \)	I. \( t_{2g}{^{2}}e_{g}{^{0}} \)
B. \( [\mathrm{Fe(H_2O)_6}]^{3+} \)	II. \( t_{2g}{^{3}}e_{g}{^{0}} \)
C. \( [\mathrm{Ni(H_2O)_6}]^{2+} \)	III. \( t_{2g}{^{3}}e_{g}{^{2}} \)
D. \( [\mathrm{V(H_2O)_6}]^{3+} \)	IV. \( t_{2g}{^{6}}e_{g}{^{2}} \)

Choose the correct answer from the options given below:

29.

Choose the correct statements from the following:
(A) Ethane-\( 1, 2 \)-diamine is a chelating ligand.
(B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite.
(C) Cyanide ion is used as ligand for leaching of silver.
(D) Phosphine act as a ligand in Wilkinson catalyst.
(E) The stability constants of \( \mathrm{Ca^{2+}} \) and \( \mathrm{Mg^{2+}} \) are similar with EDTA complexes.
Choose the correct answer from the options given below:

30.

Which one of the following complexes will exhibit the least paramagnetic behaviour? \([ \text{Atomic number, Cr} = 24, \text{ Mn} = 25, \text{ Fe} = 26, \text{ Co} = 27 ]\)

31.

The correct sequence of ligands in the order of decreasing field strength is:

32.

Select the option with correct property:

33.

Total number of unpaired elecrons in the complex ions \( [\mathrm{Co(NH_3)_6}]^{3+} \) and \( [\mathrm{NiCl_4}]^{2-} \) is:

34.

Consider the following complex ions
\( P = [\text{FeF}_6]^{3-} \)
\( Q = [\text{V}(\text{H}_2\text{O})_6]^{2+} \)
\( R = [\text{Fe}(\text{H}_2\text{O})_6]^{2+} \)
The correct order of the complex ions, according to their spin only magnetic moment values (in \( \text{B.M.} \)), is:

35.

The correct order of ligands arranged in increasing field strength.

← PreviousQuestion 20 of 35Next →

JEE Main 2024 1st Feb Morning Shift

Which of the following complex is homoleptic?

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ