JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Match List I with List II.

List I	List II
Coordination Complex	Number of unpaired electrons
A \( [\mathrm{Cr}(\mathrm{CN})_6]^{3-} \)	I \( 0 \)
B \( [\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6]^{2+} \)	II \( 3 \)
C \( [\mathrm{Co}(\mathrm{NH}_3)_6]^{3+} \)	III \( 2 \)
D \( [\mathrm{Ni}(\mathrm{NH}_3)_6]^{2+} \)	IV \( 4 \)

Choose the correct answer from the options given below :

An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is:

The spin only magnetic moment of \( [\mathrm{Mn}(\mathrm{H_2O})_6]^{2+} \) complexes is ______ B.M. \([\text{Nearest integer}]\)
\(\text{Given: Atomic number of Mn is } 25\).

Match List I with List II.

List I Complex	List II CFSE(\( \Delta_0 \))
A. \( [\text{Cu}(\text{NH}_3)_6]^{2+} \)	I. \( -0.6 \)
B. \( [\text{Ti}(\text{H}_2\text{O})_6]^{3+} \)	II. \( -2.0 \)
C. \( [\text{Fe}(\text{CN})_6]^{3-} \)	III. \( -1.2 \)
D. \( [\text{NiF}_6]^{4-} \)	IV. \( -0.4 \)

Choose the correct answer from the options given below:

Which of the following complex is octahedral, diamagnetic and the most stable?

The set which does not have ambidentate ligand(s) is:

Which of the following complex has a possibility to exist as meridional isomer?

Which of the following are the example of double salt?
A. \( \mathrm{FeSO_4\cdot (NH_4)_2 SO_4\cdot 6H_2O} \)
B. \( \mathrm{CuSO_4\cdot 4NH_3\cdot H_2O} \)
C. \( \mathrm{K_2SO_4\cdot Al_2(SO_4)_3\cdot 24H_2O} \)
D. \( \mathrm{Fe(CN)_2\cdot 4KCN} \)
Choose the correct answer:

Given below are two statements one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): \( [\mathrm{CoCl(NH_3)_5}]^{2+} \) absorbs at lower wavelength of light with respect to \( [\mathrm{Co(NH_3)_5(H_2O)}]^{3+} \)
Reason (R): It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements choose the correct answer from the options given below:

10.

The total number of stereoisomers for the complex \( \mathrm{[Cr(ox)_2ClBr]^{3-}} \) (where \( \text{ox} = \text{oxalate} \)) is:

11.

Match List-I with List-II.

Choose the correct answer from the options given below:

12.

The magnetic moment is measured in Bohr Magneton \( (\text{BM}) \)
Spin only magnetic moment of Fe in \( [\text{Fe}(\text{H}_2\text{O})_6]^{3+} \) and \( [\text{Fe}(\text{CN})_6]^{3-} \) complexes respectively is:

13.

Compound \( A \) reacts with \( \mathrm{NH_4Cl} \) and forms a compound \( B \). Compound \( B \) reacts with \( \mathrm{H_2O} \) and excess of \( \mathrm{CO_2} \) to form compound \( C \) which on passing through or reaction with saturated \( \mathrm{NaCl} \) solution forms sodium hydrogen carbonate. Compound \( A \), \( B \) and \( C \), are respectively.

14.

The volume (in \( \text{mL} \)) of \( 0.1 \ \text{M} \) \( \text{AgNO}_3 \) required for complete precipitation of chloride ions present in \( 20 \ \text{mL} \) of \( 0.01 \ \text{M} \) solution of \( [\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2 \) as silver chloride is ________.

15.

If the CFSE of \( [\mathrm{Ti(H_2O)_6}]^{3+} \) is \( -96.0 \, \mathrm{kJ/mol} \), this complex will absorb maximum at wavelength __________ nm. (Nearest integer)
Assume Planck’s constant \( (h) = 6.4 \times 10^{-34} \, \mathrm{Js} \), Speed of light \( (c) = 3.0 \times 10^{8} \, \mathrm{m/s} \) and Avogadro’s Constant \( (N_A) = 6 \times 10^{23} \, / \, \mathrm{mol} \).

16.

The octahedral diamagnetic low spin complex among the following is:

17.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In the complex \( (\mathrm{Ni}(\mathrm{CO})_4 \) and \(( \mathrm{Fe}(\mathrm{CO})_5 \) the metals have zero oxidation state.
Reason R: Low oxidation states are found when a complex has ligands capable of \( \pi \) – donor character in addition to the \( \sigma \)-bonding.
In the light of the above statements, choose the most appropriate answer from the options given below

18.

Which of the following cannot be explained by crystal field theory?

19.

Correct order of spin only magnetic moment of the following complex ions is:
(Given At. No. \( \mathrm{Fe}: 26, \ \mathrm{Co}: 267 \))

20.

The complex with highest magnitude of crystal field splitting energy \( (\Delta_0) \) is:

21.

The observed magnetic moment of the complex \( [\mathrm{Mn}(\mathrm{NCS})_6]^{x-} \) is \( 6.06 \, \mathrm{BM} \). The numerical value of \( x \) is _______.

22.

Match List I and List II :

Options :

23.

The primary and secondary valencies of cobalt respectively in \( [\mathrm{Co(NH_3)_5Cl}]\mathrm{Cl_2} \), are :

24.

The \( \mathrm{Cl\!-\!Co\!-\!Cl} \) bond angle values in a \( \mathrm{fac\!-\![Co(NH_3)_3Cl_3]} \) complex is(are):

25.

The IUPAC name of \( \mathrm{K}_3[\mathrm{Co}(\mathrm{C}_2\mathrm{O}_4)_3] \) is:

26.

Number of ambidentate ligands in a representative metal complex \( [\text{M}(\text{en})(\text{SCN})_{4}] \) is __________. [en = ethylenediamine]

27.

The complex cation which has two isomers is:

28.

If \( \mathrm{Ni^{2+}} \) is replaced by \( \mathrm{Pt^{2+}} \) in the complex \( [\mathrm{NiCl_2Br_2}]^{2-} \), which of the following properties are expected to get changed?
I. Geometry
II. Geometrical isomerism
III. Optical isomerism
IV. Magnetic properties

29.

The ratio of spin-only magnetic moment values \( \mu_{\text{eff}}[\text{Cr(CN)}_6]^{3-} / \mu_{\text{eff}}[\text{Cr(H}_2\text{O)}_6]^{3+} \) is ______ .

30.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The spin only magnetic moment value for \( [\mathrm{Fe}(\mathrm{CN})_6]^{3-} \) is \( 1.74 \, \text{BM} \), whereas for \( [\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6]^{3+} \) is \( 5.92 \, \text{BM} \).
Reason R: In both complexes, Fe is present in \( +3 \) oxidation state.
In the light of the above statements, choose the correct answer from the options given below:

31.

To inhibit the growth of tumours, identify the compounds used from the following:
A. EDTA B. Coordination compounds of \( \mathrm{Pt} \)
C. D-Penicillamine D. Cis-Platin
Choose the correct answer from the options given below:

32.

Which of the following complex will show largest splitting of \( d \)-orbitals?

33.

Chiral complex from the following is: Here en \( = \) ethylene diamine

34.

\( 1 \, \mathrm{L},\ 0.02 \, \mathrm{M} \) solution of \( [\mathrm{Co}(\mathrm{NH}_3)_5\mathrm{SO}_4]\mathrm{Br} \) is mixed with \( 1 \, \mathrm{L},\ 0.02 \, \mathrm{M} \) solution of \( [\mathrm{Co}(\mathrm{NH}_3)_5\mathrm{Br}]\mathrm{SO}_4 \). The resulting solution is divided into two equal parts \( (X) \) and treated with excess of \( \mathrm{AgNO}_3 \) solution and \( \mathrm{BaCl}_2 \) solution respectively as shown below :
\( 1 \, \mathrm{L} \) solution \( (X) + \mathrm{AgNO}_3 \) solution (excess) \( \rightarrow Y \)
\( 1 \, \mathrm{L} \) solution \( (X) + \mathrm{BaCl}_2 \) solution (excess) \( \rightarrow Z \)
The number of moles of \( Y \) and \( Z \) respectively are.

35.

The homoleptic and octahedral complex of \( \text{Co}^{2+} \) and \( \text{H}_2\text{O} \) has __________ unpaired electron(s) in the \( \text{t}_{2g} \) set of orbitals.

36.

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are \( \_ \_ \_ \_ \_ \_ \_ \_ \_ \_ \).
A. \( 1 \, \text{M} \) aq. \( \mathrm{NaCl} \) and \( 2 \, \text{M} \) aq. Urea
B. \( 1 \, \text{M} \) aq. \( \mathrm{CaCl}_2 \) and \( 1.5 \, \text{M} \) aq. \( \mathrm{KCl} \)
C. \( 1.5 \, \text{M} \) aq. \( \mathrm{AlCl}_3 \) and \( 2 \, \text{M} \) aq. \( \mathrm{Na}_2\mathrm{SO}_4 \)
D. \( 2.5 \, \text{M} \) aq. \( \mathrm{KCl} \) and \( 1 \, \text{M} \) aq. \( \mathrm{Al}_2(\mathrm{SO}_4)_3 \)

37.

The sum of bridging carbonyls in \( \mathrm{W(CO)_6} \) and \( \mathrm{Mn_2(CO)_{10}} \) is ________.

38.

The mismatch combinations are:
A. Chlorophyll–Co B. Water hardness – EDTA C. Photography – \( [\text{Ag}(\text{CN})_{2}]^{-} \) D. Wilkinson catalyst – \( [(\text{Ph}_{3}\text{P})_{3}\text{RhCl}] \) E. Chelating ligand – D-Penicillamine
Choose the correct answer from the options given below:

39.

The correct order of the number of unpaired electrons in the given complexes is:
(A) \( [\mathrm{Fe}(\mathrm{CN})_6]^{3-} \) (B) \( [\mathrm{FeF}_6]^{3-} \)
(C) \( [\mathrm{CoF}_6]^{3-} \) (D) \( [\mathrm{Cr}(\text{oxalate})_3]^{3-} \)
(E) \( [\mathrm{Ni}(\mathrm{CO})_4] \)
Choose the correct answer from the options given below:

40.

Total number of moles of \( \mathrm{AgCl} \) precipitated on addition of excess of \( \mathrm{AgNO_3} \) to one mole each of the following complexes \( [\mathrm{Co(NH_3)_4Cl_2}]\mathrm{Cl} \), \( [\mathrm{Ni(H_2O)_6}]\mathrm{Cl_2} \), \( [\mathrm{Pt(NH_3)_2Cl_2}] \) and \( [\mathrm{Pd(NH_3)_4}]\mathrm{Cl_2} \) is _______.

41.

Which of the following is correct order of ligand field strength?

42.

The correct order of spin only magnetic moments for the following complex ions is:

43.

The d-electronic configuration of \( [\text{CoCl}_4]^{2-} \) in tetrahedral crystal field is \( e^{m} t_{2}^{n} \). Sum of “m” and “n” _________.

44.

In potassium ferrocyanide, there are ______ pairs of electrons in the \( t_{2g} \) set of orbitals.

45.

Match List I with List II.

Choose the correct answer from the options given below:

46.

The hybridization and magnetic behaviour of cobalt ion in \( [\mathrm{Co}(\mathrm{NH}_3)_6]^{3+} \) complex, respectively is:

47.

The number of paramagnetic species from the following is ____________ .
\( [\mathrm{Ni(CN)_4}]^{2-},\ [\mathrm{Ni(CO)_4}],\ [\mathrm{NiCl_4}]^{2-},\ [\mathrm{Fe(CN)_6}]^{4-},\ [\mathrm{Cu(NH_3)_4}]^{2+},\ [\mathrm{Fe(CN)_6}]^{3-} \) and \( [\mathrm{Fe(H_2O)_6}]^{2+} \)

← PreviousQuestion 21 of 47Next →

JEE Main 2023 8th April Evening Shift

The observed magnetic moment of the complex \( [\mathrm{Mn}(\mathrm{NCS})_6]^{x-} \) is \( 6.06 \, \mathrm{BM} \). The numerical value of \( x \) is _______.

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ