Which metal ion is present in Vitamin- B₁₂?

1. Zinc

2. Calcium

3. Iron

4. Cobalt

The compound having tetrahedral geometry is-

1. ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$

2. ${\left[Pd{\left(CN\right)}_4\right]}^{2-}$

3. ${\left[PdC{l}_4\right]}^{2-}$

4. ${\left[NiC{l}_4\right]}^{2-}$

Spin only magnetic moment of the compound $Hg\left[Co{\left(SCN\right)}_4\right]$ is

1. $\sqrt{3}$

2. $\sqrt{15}$

3. $\sqrt{24}$

4. $\sqrt{8}$

Which kind of isomerism is exhibited by octahedral Co(NH₃)₄Br₂Cl?

1. Geometrical and ionization

2. Geometrical and optical

3. Optical and ionization

4. Geometrical only

Which pair of compounds is expected to show similar colour in aqueous medium?

1. $FeC{l}_3 and CuC{l}_2$

2. $VOC{l}_2 and CuC{l}_2$

3. $VOC{l}_2 and FeC{l}_2$

4. $FeC{l}_2 and MnC{l}_2$

$CuS{O}_4$ decolourises on addition of excess KCN, the product is-

1. ${\left[Cu{\left(CN\right)}_4\right]}^{2-}$

2. ${\left[Cu{\left(CN\right)}_4\right]}^{3-}$

3. $Cu{\left(CN\right)}_2$

4. CuCN

If the bond length of CO bond in carbon monoxide is 1.128 $\stackrel{0}{A}$, then what is the value of CO bond length is $Fe{\left(CO\right)}_5$ ?

1. 1.15 $\stackrel{0}{A}$

2. 1.128 $\stackrel{0}{A}$

3. 1.72 $\stackrel{0}{A}$

4. 1.118 $\stackrel{0}{A}$

Among the following metal carbonyls, the C-O bond order is lowest in

1. ${\left[Mn{\left(CO\right)}_6\right]}^{+}$

2. $\left[Fe{\left(CO\right)}_5\right]$

3. $\left[Cr{\left(CO\right)}_6\right]$

4. ${\left[V{\left(CO\right)}_6\right]}^{-}$

Geometrical shapes of the complexes formed by the reaction of $N{i}^{2+} with C{l}^{-}, C{N}^{-} and H_{2}O$ respectively, are

1. Octahedral, tetrahedral and square planar

2. Tetrahedral, square planar and octahedral

3. Square planar, tetrahedral and octahedral

4. Octahedral, square planar and octahedral

The volume (in mL) of 0.1 M AgNO₃ required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H₂O)₅Cl]Cl₂, as silver chloride is close to

1. 4

2. 6

3. 20

4. 60