Mark the correct statement.

Match List-$I$ with List-$II$.

List-$I$ (Complex)	List-$II$ (Colour)
$A$. $Mg(NH_4)PO_4$	$I$. Brown
$B$. $K_3[Co(NO_2)_6]$	$II$. White
$C$. $MnO(OH)_2$	$III$. Yellow
$D$. $Fe_4[Fe(CN)_6]_3$	$IV$. Blue

Choose the correct answer from the options given below:

Given below are two statements:
Statement $I$: Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis.
Statement $II$: Phenolphthalein is a weak base, therefore it dissociates in acidic medium.

Which of the following statements is incorrect?

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$BaCrO_4 \downarrow + CH_3COOH \text{ (Excess)} \longrightarrow \text{No reaction}$

Which of the following chemicals may be used to identify three unlabelled beakers containing conc. $NaOH$, conc. $H_{2}SO_{4}$ and water?