JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Three moles of $ \mathrm{AgCl} $ get precipitated when one mole of an octahedral co-ordination compound with empirical formula $ \mathrm{CrCl_3 \cdot 3NH_3 \cdot 3H_2O} $ reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is __________.

$ 3 $ moles of metal complex with formula $ \mathrm{Co(en)_2Cl_3} $ gives $ 3 $ moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is: ___________. (Round off to the Nearest Integer).

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Choose the correct option:

The type of hybridisation and magnetic property of the complex $ [\mathrm{MnCl_6}]^{3-} $, respectively, are:

The overall stability constant of the complex ion $ [\mathrm{Cu}(\mathrm{NH}_{3})_{4}]^{2+} $ is $ 2.1 \times 10^{13} $. The overall dissociation constant is $ y \times 10^{-14} $. Then $ y $ is _______. (Nearest integer)

The number of geometrical isomers possible in triamminenitritocobalt $ (\text{III}) $ is $ X $ and in trioxalatochromate $ (\text{III}) $ is $ Y $. Then the value of $ X + Y $ is ________.

The total number of unpaired electrons present in $ [\mathrm{Co(NH_3)_6}]\mathrm{Cl}_2 $ and $ [\mathrm{Co(NH_3)_6}]\mathrm{Cl}_3 $ is:

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers $ \mathrm{Ce} = 58 $, $ \mathrm{Gd} = 64 $ and $ \mathrm{Eu} = 63 $.)
(a) $ (\mathrm{NH_4})_2[\mathrm{Ce}(\mathrm{NO_3})_6] $ (b) $ \mathrm{Gd}(\mathrm{NO_3})_3 $ and (c) $ \mathrm{Eu}(\mathrm{NO_3})_3 $
Answer is:

Which one of the following complexes is violet in colour?

10.

Which one of the following species responds to an external magnetic field?

11.

Spin only magnetic moment of an octahedral complex of $ \mathrm{Fe^{2+}} $ in the presence of a strong field ligand in $ \text{BM} $ is:

12.

Which one of the following molecules does not show stereo isomerism?

13.

The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

14.

The crystal field stabilization energy (CFSE) and magnetic (spin-only) of an octahedral aqua complex of a metal ion $ (M^{z+}) $ are $ -0.8\,\Delta_0 $ and $ 3.87\,\text{BM} $, respectively. Identify $ (M^{Z+}) $:

15.

Given below are two statements:
Statement I: $ [\mathrm{Mn(CN)_6}]^{3-} $, $ [\mathrm{Fe(CN)_6}]^{3-} $ and $ [\mathrm{Co(C_2O_4)_3}]^{3-} $ are $ d^2sp^3 $ hybridized.
Statement II: $ [\mathrm{MnCl_6}]^{3-} $ and $ [\mathrm{FeF_6}]^{3-} $ are paramagnetic and have $ 4 $ and $ 5 $ unpaired electrons, respectively.
In the light of the above statements, choose the correct answer from the options given below:

16.

An aqueous solution of $ \text{NiCl}_2 $ was heated with excess sodium cyanide in presence of strong oxidizing agent to form $ [\text{Ni}(\text{CN})_6]^{2-} $. The total change in number of unpaired electrons on metal centre is ________.

17.

The denticity of an organic ligand, biuret is:

18.

The number of acyclic structural isomers (including geometrical isomers) for pentene are ______.

19.

Which one of the following metal complexes is most stable?

20.

The number of geometrical isomers found in the metal complexes $ [\mathrm{PtCl_2(NH_3)_2}] $, $ [\mathrm{Ni(CO)_4}] $, $ [\mathrm{Ru(H_2O)_3Cl_3}] $, and $ [\mathrm{CoCl_2(NH_3)_4}]^{+} $ respectively, are:

21.

The calculated magnetic moments (spin only value) for species $ [\mathrm{FeCl_4}]^{2-} $, $ [\mathrm{Co(C_2O_4)_3}]^{3-} $ and $ \mathrm{MnO_4^{2-}} $ respectively are:

22.

Spin only magnetic moment in BM of $ [\mathrm{Fe}(\mathrm{CO})_4(\mathrm{C_2O_4})]^+ $ is:

23.

Indicate the complex/complex ion which did not show any geometrical isomerism:

24.

The correct structures of trans-$ [\mathrm{NiBr_2}(\mathrm{PPh_3})_2] $ and meridional-$ [\mathrm{Co}(\mathrm{NH_3})_3(\mathrm{NO_2})_3] $, respectively, are:

25.

$ 1 $ mol of an octahedral metal complex with formula $ \mathrm{MCl_3 \cdot 2L} $ on reaction with excess of $ \mathrm{AgNO_3} $ gives $ 1 $ mol of $ \mathrm{AgCl} $. The denticity of Ligand $ \mathrm{L} $ is __________. (Integer answer)

26.

The number of optical isomers possible for $ [\mathrm{Cr(C_2O_4)_3}]^{3-} $ is _______.

27.

Match List-I with List-II :

List-I	List-II
(a) $ [\mathrm{Co(NH_3)_6}][\mathrm{Cr(CN)_6}] $	(i) Linkage isomerism
(b) $ [\mathrm{Co(NH_3)_3}(\mathrm{NO_2})_3] $	(ii) Solvate isomerism
(c) $ [\mathrm{Cr(H_2O)_6}]\mathrm{Cl}_3 $	(iii) Co-ordination isomerism
(d) $ \mathrm{cis}-[\mathrm{CrCl_2(ox)_2}]^{3-} $	(iv) Optical isomerism

Choose the correct answer from the options given below :

28.

According to the valence bond theory the hybridization of central metal atom is $ dsp^2 $ for which one of the following compounds?

29.

The spin-only magnetic moment value for the complex $ [\mathrm{Co(CN)_6}]^{4-} $ is ________ BM. [At. no. of Co $ = 27 $]

30.

The secondary valency and number of hydrogen bonded water molecules in $ \mathrm{CuSO_4 \cdot 5H_2O} $, respectively, are:

31.

The sum of oxidation states of two silver ions in $[\mathrm{Ag}(\mathrm{NH}_3)_2][\mathrm{Ag}(\mathrm{CN})_2]$ complex is:

32.

The total number of unpaired electrons present in the complex $ \mathrm{K_3[Cr(oxalate)_3]} $ is __________.

33.

The correct order of intensity of colors of the compounds is:

34.

$[\mathrm{Ti}(\mathrm{H}_2\mathrm{O})_6]^{3+} $ absorbs light of wavelength $ 498 \, \text{nm} $ during a d – d transition. The octahedral splitting energy for the above complex is __________ $ \times 10^{-19} \, \text{J} $. (Round off to the Nearest Integer). $ h = 6.626 \times 10^{-34} \, \text{Js}; \, c = 3 \times 10^{8} \, \text{m s}^{-1} $.

← PreviousQuestion 16 of 34Next →

JEE Main 2021 20th July Evening Shift

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ