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

The coordination geometry around the manganese in decacarbonyldimanganese $$(0)$$ is

Choose the correct statements from the following : (A) Ethane-1, 2-diamine is a chelating ligand. (B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite. (C) Cyanide ion is used as ligand for leaching of silver. (D) Phosphine act as a ligand in Wilkinson catalyst. (E) The stability constants of $${\mathrm{Ca}}^{2+}$$ and $${\mathrm{Mg}}^{2+}$$ are similar with EDTA complexes. Choose the correct answer from the options given below :

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I LIST II A. $${\mathrm{K}}_2\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]$$ I. $$s{p}^3$$ B. $$\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$$ II. $$s{p}^3{d}^2$$ C. $$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$$ III. $$ds{p}^2$$ D. $${\mathrm{Na}}_3\left[{\mathrm{CoF}}_6\right]$$ IV. $$d^{2}s{p}^3$$ Choose the correct answer from the options given below:

The coordination environment of $${\mathrm{Ca}}^{2+}$$ ion in its complex with $${\mathrm{EDTA}}^{4-}$$ is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The total number of geometrical isomers shown by $$[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2{]}^{+}$$ complex ion is three. Reason (R): $$[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2{]}^{+}$$ complex ion has an octahedral geometry. In the light of the above statements, choose the most appropriate answer from the options given below :

Number of complexes from the following with even number of unpaired "$$\mathrm{d}$$" electrons is ________ $$[\mathrm{V}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},[\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+},[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},[\mathrm{Cu}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$$ [Given atomic numbers: $$\mathrm{V}=23,\mathrm{Cr}=24,\mathrm{Fe}=26,\mathrm{Ni}=28\mathrm{Cu}=29$$]

The correct sequence of ligands in the order of decreasing field strength is :

If an iron (III) complex with the formula $${\left[\mathrm{Fe}{\left({\mathrm{NH}}_3\right)}_x(\mathrm{CN}{)}_y\right]}^{-}$$ has no electron in its $$e_g$$ orbital, then the value of $$x+y$$ is

The number of unpaired d-electrons in $${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$$ is ________.

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of $$3.86\mathrm{BM}$$. The atomic number of the metal is

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I (Complex ion) LIST II (Spin only magnetic moment in B.M.) A. $${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$$ I. 4.90 B. $${\left[{\mathrm{NiCl}}_4\right]}^{2-}$$ II. 3.87 C. $${\left[{\mathrm{CoF}}_6\right]}^{3-}$$ III. 0.0 D. $${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$$ IV. 2.83 Choose the correct answer from the options given below :

Number of Complexes with even number of electrons in $${\mathrm{t}}_{2g}$$ orbitals is - $${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+},{\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+},{\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+},{\left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+},{\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$$

An octahedral complex with the formula $${\mathrm{CoCl}}_3\cdot {\mathrm{nNH}}_3$$ upon reaction with excess of $${\mathrm{AgNO}}_3$$ solution gives 2 moles of $$\mathrm{AgCl}$$. Consider the oxidation state of $$\mathrm{Co}$$ in the complex is '$$x$$'. The value of "$$x+n$$" is __________.

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:

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I (Compound) LIST II (Colour] A. $${\mathrm{Fe}}_4{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}_3\cdot \mathrm{x}{\mathrm{H}}_2\mathrm{O}$$ 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. $${\left({\mathrm{NH}}_4\right)}_3{\mathrm{PO}}_4\cdot 12{\mathrm{MoO}}_3$$ IV. Yellow Choose the correct answer from the options given below:

The correct order of ligands arranged in increasing field strength.

Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, $$\mathrm{Cr}=24,\mathrm{Mn}=25,\mathrm{Fe}=26,\mathrm{Co}=27$$]

The number of complexes from the following with no electrons in the $$t_2$$ orbital is ______. $${\mathrm{TiCl}}_4,{\left[{\mathrm{MnO}}_4\right]}^{-},{\left[{\mathrm{FeO}}_4\right]}^{2-},{\left[{\mathrm{FeCl}}_4\right]}^{-},{\left[{\mathrm{CoCl}}_4\right]}^{2-}$$

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and $$\mathrm{M}$$ is metal) involves $${\mathrm{sp}}^3$$ hybridization. The number of geometrical isomers exhibited by the complex is :