Applications in analysis, extraction and biological systems — NEET & JEE Questions

Question 1 · difficulty L1 · recall

EDTA is widely used in complexometric analysis because it

• A. forms stable chelate complexes with many metal ions
• B. is a strong oxidising gas
• C. contains no donor atoms
• D. precipitates all anions selectively

Question 2 · difficulty L2 · understanding

The sum of bridging carbonyls in $$\mathrm{W(CO)_6}$$ and $$\mathrm{Mn_2(CO)_{10}}$$ is ____________.

Question 3 · difficulty L2 · understanding

Given below are two statements: Statement I: $$\mathrm{N}\left(\mathrm{CH}_3\right)_3$$ and $$\mathrm{P}\left(\mathrm{CH}_3\right)_3$$ can act as ligands to form transition metal complexes. Statement II: As N and P are from same group, the nature of bonding of $$\mathrm{N}\left(\mathrm{CH}_3\right)_3$$ and $$\mathrm{P}\left(\mathrm{CH}_3\right)_3$$ is always same with transition metals. In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both Statement I and Statement II are incorrect.
• B. Both Statement I and Statement II are correct.
• C. Statement I is incorrect but Statement II is correct.
• D. Statement I is correct but Statement II is incorrect.

Question 4 · difficulty L2 · understanding

Match List I with List II LIST I (Compound) LIST II (Colour] A. $$\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH_2O}$$ I. Violet B. $$\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-}$$ II. Blood Red C. $$[\mathrm{Fe}(\mathrm{SCN})]^{2+}$$ III. Prussian Blue D. $$\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4\cdot12 \mathrm{MoO}_3$$ IV. Yellow Choose the correct answer from the options given below:

• A. A-IV, B-I, C-II, D-III
• B. A-I, B-II, C-III, D-IV
• C. A-II, B-III, C-IV, D-I
• D. A-III, B-I, C-II, D-IV

Question 5 · difficulty L2 · understanding

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

• A. dimethyl glyoxime
• B. sodium nitroprusside
• C. meta-dinitrobenzene
• D. neutral $$\mathrm{FeCl}_3$$

Question 6 · difficulty L2 · understanding

Match List I with List II List - I (Substances) List - II (Element Present) (A) Ziegler catalyst (I) Rhodium (B) Blood Pigment (II) Cobalt (C) Wilkinson catalyst (III) Iron (D) Vitamin $$\mathrm{B_{12}}$$ (IV) Titanium Choose the correct answer from the options given below:

• A. A-IV, B-III, C-I, D-II
• B. A-II, B-IV, C-I, D-III
• C. A-III, B-II, C-IV, D-I
• D. A-II, B-III, C-IV, D-I

Question 7 · difficulty L2 · understanding

Identity the incorrect pair from the following :

• A. Haber process - Iron
• B. Polythene preparation - $$\mathrm{TiCl}_4, \mathrm{Al}\left(\mathrm{CH}_3\right)_3$$
• C. Photography - AgBr
• D. Wacker process - $$\mathrm{Pt} \mathrm{Cl}_2$$

Question 8 · difficulty L2 · understanding

Match List I with List II LIST I Complex LIST II Colour A. $$Mg(N{H_4})P{O_4}$$ I. brown B. $${K_3}[Co{(N{O_2})_6}]$$ II. white C. $$MnO{(OH)_2}$$ III. yellow D. $$F{e_4}{[Fe{(CN)_6}]_3}$$ IV. blue Choose the correct answer from the options given below :

• A. A-II, B-IV, C-I, D-III
• B. A-II, B-III, C-I, D-IV
• C. A-III, B-IV, C-II, D-I
• D. A-II, B-III, C-IV, D-I

Question 9 · difficulty L2 · understanding

The complex that dissolves in water is :

• A. $$\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$$
• B. $$\left(\mathrm{NH}_{4}\right)_{3}\left[\mathrm{As}\left(\mathrm{Mo}_{3} \mathrm{O}_{10}\right)_{4}\right]$$
• C. $$\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)_{6}\right]$$
• D. $$\left[\mathrm{Fe}_{3}(\mathrm{OH})_{2}(\mathrm{OAc})_{6}\right] \mathrm{Cl}$$

Question 10 · difficulty L2 · understanding

A solution of $$\mathrm{FeCl_3}$$ when treated with $$\mathrm{K_4[Fe(CN)_6]}$$ gives a prussium blue precipitate due to the formation of :

• A. $$\mathrm{Fe[Fe(CN)_{6}]}$$
• B. $$\mathrm{Fe_{4}[Fe(CN)_{6}]_{3}}$$
• C. $$\mathrm{Fe_{3}[Fe(CN)_{6}]_{2}}$$
• D. $$\mathrm{K[Fe_{2}(CN)_{6}]}$$