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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:

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:

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:

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.

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

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

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:

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 \( \mathrm{E} \).