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JEE Mains | PYQ

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:

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 \( \mathrm{E} \).