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Choose the correct colour of the product for the following reaction.

The statements that are incorrect about the Nickel(II) complex of dimethylglyoxime are:
A. It is red in colour.
B. It has a high solubility in water at \( \mathrm{pH} = 9 \).
C. The Ni ion has two unpaired d-electrons.
D. The N – Ni – N bond angle is almost close to \( 90^\circ \).
E. The complex contains four five-membered metallacycles (metal containing rings).
Choose the correct answer from the options given below:

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)

An indicator ‘X’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with \( \mathrm{H_2O_2} \) at room temp. The indicator ‘X’ forms blue coloured complex with compound ‘A’ present in the solution. The indictor ‘X’ and compound ‘A’ respectively are:

Treatment of a gas 'X' with a freshly prepared ferrous sulphate solution gives a compound 'Y' as a brown ring. The compounds X and Y are:

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:

Among \( \mathrm{Fe^{2+}} \), \( \mathrm{Fe^{3+}} \), \( \mathrm{Cr^{2+}} \) and \( \mathrm{Zn^{2+}} \), the ion that shows positive borax bead test and with highest ionization enthalpy is:

Formation of which complex, among the following, is not a confirmatory test of \( \mathrm{Pb^{2+}} \) ions

Molar mass of the salt from \( \mathrm{NaBr} \), \( \mathrm{NaNO_3} \), \( \mathrm{KI} \) and \( \mathrm{CaF_2} \) which does not evolve coloured vapours on heating with concentrated \( \mathrm{H_2SO_4} \) is ______ \( \mathrm{g \, mol^{-1}} \).
(Molar mass in \( \mathrm{g \, mol^{-1}} \): \( \mathrm{Na}: 23 \), \( \mathrm{N}: 14 \), \( \mathrm{K}: 39 \), \( \mathrm{O}: 16 \), \( \mathrm{Br}: 80 \), \( \mathrm{I}: 127 \), \( \mathrm{F}: 19 \), \( \mathrm{Ca}: 40 \))

A chloride salt solution acidified with dil. \( \mathrm{HNO_3} \) gives a curdy white precipitate, \( [A] \), on addition of \( \mathrm{AgNO_3} \). \( [A] \) on treatment with \( \mathrm{NH_4OH} \) gives a clear solution, \( B \). \( A \) and \( B \) are respectively,

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral \( \mathrm{FeCl_3} \), it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains:

\( \mathrm{Cu^{2+}} \) salt reacts with potassium iodide to give:

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:

A first row transition metal \( (M) \) does not liberate \( \mathrm{H_2} \) gas from dilute \( \mathrm{HCl} \). \( 1 \) mol of aqueous solution of \( \mathrm{MSO_4} \) is treated with excess of aqueous \( \mathrm{KCN} \) and then \( \mathrm{H_2S(g)} \) is passed through the solution. The amount of \( \mathrm{MS} \) (metal sulphide) formed from the above reaction is \( \_\_\_\_\_\_ \) mol.

\( \mathrm{NaCl} \) reacts with conc. \( \mathrm{H_2SO_4} \) and \( \mathrm{K_2Cr_2O_7} \) to give reddish fumes \( (B) \), which react with \( \mathrm{NaOH} \) to give yellow solution \( (C) \). \( (B) \) and \( (C) \) respectively are:

To an aqueous solution containing ions such as \( \mathrm{Al^{3+}}, \mathrm{Zn^{2+}}, \mathrm{Ca^{2+}}, \mathrm{Fe^{3+}}, \mathrm{Ni^{2+}}, \mathrm{Ba^{2+}} \) and \( \mathrm{Cu^{2+}} \) was added conc. \( \mathrm{HCl} \), following by \( \mathrm{H_2S} \).
The Total number of cations precipitated during this reaction is/are:

The oxidation number of iron in the compound formed during brown ring test for \( \mathrm{NO_3^-} \) ion is _______.

A reagent which gives brilliant red precipitate with Nickel ions in basic medium is:

Consider the following test for a group-\( \text{IV} \) cation.
\( \text{M}^{2+} + \text{H}_2\text{S} \rightarrow \text{A} \) (Black precipitate) \( + \) byproduct
\( \text{A} + \) aqua regia \( \rightarrow \text{B} + \text{NOCl} + \text{S} + \text{H}_2\text{O} \)
\( \text{B} + \text{KNO}_2 + \text{CH}_3\text{COOH} \rightarrow \text{C} + \) byproduct
The spin-only magnetic moment value of the metal complex \( \text{C} \) is __ \( \text{BM} \) (Nearest integer)

The addition of dilute \( \mathrm{NaOH} \) to \( \mathrm{Cr^{3+}} \) salt solution will give :

A solutions of \( \mathrm{Cr_2O_5} \) in amyl alcohol has a ____________ colour.

During the qualitative analysis of \( \mathrm{SO_3^{2-}} \) using dilute \( \mathrm{H_2SO_4} \), \( \mathrm{SO_2} \) gas is evolved which turns \( \mathrm{K_2Cr_2O_7} \) solution (acidified with dilute \( \mathrm{H_2SO_4} \)).

The complex that dissolves in water is:

Given below are two statements:
Statement (I): The gas liberated on warming a salt with dil \( \mathrm{H_2SO_4} \), turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion.
Statement (II): In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:

Match the List-I with List-II.

Choose the correct answer from the options given below:

The number of white coloured salts, among the following is _______.
(a) \( \mathrm{SrSO_4} \) (b) \( \mathrm{Mg(NH_4)PO_4} \) (c) \( \mathrm{BaCrO_4} \) (d) \( \mathrm{Mn(OH)_2} \)
(e) \( \mathrm{PbSO_4} \) (f) \( \mathrm{PbCrO_4} \) (g) \( \mathrm{AgBr} \) (h) \( \mathrm{PbI_2} \)
(i) \( \mathrm{CaC_2O_4} \) (j) \( [\mathrm{Fe(OH)_2(CH_3COO)}] \)

When borax is heated with \( \mathrm{CoO} \) on a platinum loop, blue coloured bead formed is largely due to:

On passing a gas, 'X', through Nessler's reagent, a brown precipitate is obtained. The gas 'X' is:

Given below are two statements:
Statement I: Griss-Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and $\alpha$ -naphthylamine reagent.
Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with $\alpha$ -naphthylamine forms an azo-dye.
In the light of the above statements, choose the correct answer from the options given below

The compound that is white in color is:

\( \mathrm{K_2Cr_2O_7} \) paper acidified with dilute \( \mathrm{H_2SO_4} \) turns green when exposed to:

\( 0.8 \, \text{g} \) of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be \( 42\% \), then ________ \( \text{mL} \) of \( 1 \, \text{M} \; \mathrm{H_2SO_4} \) would have been neutralized by the ammonia evolved during the analysis.

\( \mathrm{KMnO}_{4} \) 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 _______.

A white precipitate was formed when \( \mathrm{BaCl_2} \) was added to water extract of an inorganic salt. Further, a gas ‘\( X \)’ with characteristic odour was released when the formed white precipitate was dissolved in dilute \( \mathrm{HCl} \). The anion present in the inorganic salt is:

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

In the precipitation of the iron group \( (\text{III}) \) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to:

Yellow compound of lead chromate gets dissolved on treatment with hot \( \text{NaOH} \) solution. The product of lead formed is a :

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 ________.
\( \mathrm{Cu^{2+},\ Fe^{3+},\ Ba^{2+},\ Ca^{2+},\ NH_4^{+},\ Mg^{2+},\ Zn^{2+}} \)

\( \mathrm{Fe^{3+}} \) cation gives a Prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:

In the Group analysis of cations, \( \mathrm{Ba^{2+}} \) and \( \mathrm{Ca^{2+}} \) are precipitated respectively as:

Given below are two statements:

Statement I: On passing \( \mathrm{HCl_{(g)}} \) through a saturated solution of \( \mathrm{BaCl_2} \) at room temperature white turbidity appears.
Statement II: When \( \mathrm{HCl} \) gas is passed through a saturated solution of \( \mathrm{NaCl} \), sodium chloride is precipitated due to common ion effect.
In the light of the above statements, choose the most appropriate answer from the options given below:

In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is __________ \( \text{BM} \) (Nearest integer) [Given atomic number of Cu = \( 29 \), Ni = \( 28 \), Mn = \( 25 \), Fe = \( 26 \)].

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in \( \mathrm{NH_4OH} \) solution when sodium carbonate extract was first acidified with dil. \( \mathrm{HNO_3} \) and then \( \mathrm{AgNO_3} \) solution was added. This indicates presence of:

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:

In the wet tests for detection of various cations by precipitation, \( \mathrm{Ba^{2+}} \) cations are detected by obtaining precipitate of:

The azo-dye (Y) formed in the following reaction is.
Sulphanilic acid + \( \text{NaNO}_2 \) + \( \text{CH}_3\text{COOH} \) \( \rightarrow \) X.

Number of metal ions characterized by flame test among the following is ________.
\( \mathrm{Sr^{2+}} \), \( \mathrm{Ba^{2+}} \), \( \mathrm{Ca^{2+}} \), \( \mathrm{Cu^{2+}} \), \( \mathrm{Zn^{2+}} \), \( \mathrm{Co^{2+}} \), \( \mathrm{Fe^{2+}} \)

Among \( \mathrm{Fe^{3+}} \), \( \mathrm{Pb^{2+}} \), \( \mathrm{Cu^{2+}} \) and \( \mathrm{Mn^{2+}} \), identify the one that gets precipitated out while passing \( \mathrm{H_2S} \) in presence of \( \mathrm{NH_4OH} \) as group reagent. The highest possible oxidation state of the corresponding metal is:

While preparing crystals of Mohr's salt, dil \( \mathrm{H_2SO_4} \) is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil \( \mathrm{H_2SO_4} \) is added here to:

A ‘p’-block element \( \mathrm{(E)} \) and hydrogen form a binary cation \( (\mathrm{EH_x})^{+} \), while \( \mathrm{EH_3} \) on treatment with \( \mathrm{K_2HgI_4} \) in alkaline medium gives a precipitate of basic mercury(II) amido-iodine. Given below are first ionisation enthalpy values (\( \mathrm{kJ\,mol^{-1}} \)) for first element each from group \( 13 \), \( 14 \), \( 15 \) and \( 16 \). Identify the correct first ionisation enthalpy value for element \( \mathrm{E} \).

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JEE Main 2025 24th Jan Evening Shift

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