The volume (in $mL$) of $0.125\; M\; AgNO_{3}$ required to quantitatively precipitate chloride ions in $0.3\; g$ of $[Co(NH_{3})_{6}]Cl_{3}$ is (Given: $M_{[Co(NH_{3})_{6}]Cl_{3}} = 267.46\; g/mol$,$M_{AgNO_{3}} = 169.87\; g/mol$).

Given below are two statements.
Statement $I$: In $CuSO_{4} \cdot 5H_{2}O$,$Cu-O$ bonds are present.
Statement $II$: In $CuSO_{4} \cdot 5H_{2}O$,ligands coordinating with $Cu(II)$ ion are $O$- and $S$-based ligands.
In the light of the above statements,choose the correct answer from the options given below.

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.
$(I)$ Sulphide ions react with $Na_2[Fe(CN)_5(NO)]$ to form a purple coloured compound $Na_4[Fe(CN)_5(NOS)]$. In the reaction,the oxidation state of iron changes.
$(II)$ $Pt(IV)$ compounds are relatively more stable than $Ni(IV)$ compounds.
$(III)$ The welding of magnesium can be done in the atmosphere of Helium.
$(IV)$ $LiAlH_4$ on hydrolysis will give $H_2$.

Which of the following statements is correct?

Which will give $Fe^{3+}$ ions in solution?

The complexes given below show: