Flexidentate Ligands

Q. Which of the following can act as both monodentate and bidentate ligand?

1. $S{O}_4^{2-}$
2. None of the above
3. $C{N}^{-}$
4. $H_{2}O$

Q. When EDTA solution is added to $M{g}^{2+}$ solution, then which of the following statement is true

1. Four coordination sites of $M{g}^{2+}$ are occupied by EDTA and remaining two sites are occupied by water molecules.
2. All six coordination sites of $M{g}^{2+}$ are occupied.
3. pH of the solution is decreased.
4. Colourless $[Mg-EDTA{]}^{2-}$ chelate is formed.

Q. Given below are two statements:


Statement I: The identification of $N{i}^{2+}$ is carried out by dimethylglyoxime in the presence of $N{H}_{4}OH$

Statement II: The dimethylglyoxime is a bidentate neutral ligand.

In the light of the above statements, choose the correct answer from the options given below

1. Both statement I and statement II are true
2. Both statement I and statement II are false
3. Statement I is false but statement II is true
4. Statement I is true but statement II is false

Q. How many EDTA molecules are required to make an octahedral complex with a $C{a}^{2+}$ ion?

1. 3
2. 1
3. 2
4. 6