JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Consider the following low-spin complexes
\( \mathrm{K_3[Co(NO_2)_6]} \), \( \mathrm{K_4[Fe(CN)_6]} \), \( \mathrm{K_3[Fe(CN)_6]} \), \( \mathrm{Cu_2[Fe(CN)_6]} \) and \( \mathrm{Zn_2[Fe(CN)_6]} \).
The sum of the spin-only magnetic moment values of complexes having yellow colour is ________ B.M. (answer in nearest integer)

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is:

Formation of \( \mathrm{Na_4[Fe(CN)_5NOS]} \), a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

\( \mathrm{KMnO}_{4} \) acts as an oxidizing agent in acidic medium. ‘\( X \)’ is the difference between the oxidation states of \( \mathrm{Mn} \) in reactant and product. ‘\( Y \)’ is the number of ‘\( d \)’ electrons present in the brown red precipitate formed at the end of the acetate ion test with neutral ferric chloride. The value of \( X + Y \) is _______.

Identify A, B and C in the given below reaction sequence:

Find the compound ‘\( A \)’ from the following reaction sequences.
\( \text{A} \xrightarrow{\text{aqua-regia}} \text{B} \xrightarrow[(2)\text{AcOH}]{(1)\text{KNO}_2/\text{NH}_4\text{OH}} \text{yellow ppt}\)

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with \( \mathrm{K_4[Fe(CN)_6]} \) is ________.
\( \mathrm{Cu^{2+},\ Fe^{3+},\ Ba^{2+},\ Ca^{2+},\ NH_4^{+},\ Mg^{2+},\ Zn^{2+}} \)

Identify the inorganic sulphides that are yellow in colour:
(A) \( (\mathrm{NH}_4)_2\mathrm{S} \)
(B) \( \mathrm{PbS} \)
(C) \( \mathrm{CuS} \)
(D) \( \mathrm{As}_2\mathrm{S}_3 \)
(E) \( \mathrm{As}_2\mathrm{S}_5 \)
Choose the correct answer from the options given below:

← PreviousQuestion 3 of 8Next →

JEE Main 2025 2nd April Evening Shift

Formation of \( \mathrm{Na_4[Fe(CN)_5NOS]} \), a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of: