MCQ
Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is
- A$3$
- B$4$
- C$5$
- ✓$6$
The reaction is as follows:
$K _2 Cr _2 O _7+6 F eSO _4+7 H _2 SO _4 \rightarrow K _2 SO _4+ Cr _2\left( SO _4\right)_3+3 Fe _2\left( SO _4\right)_3+7 H _2 O$
$1$ mole of potassium dichromate reacts with 6 moles of ferrous sulphate. Thus, the number of moles of Mohr's salt required per mole of dichromate is $6.$
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$(a)$ $[Co(en)_2Cl_2]Br$
$(b)$ $[Pt(NH_3)_2Cl_2Br_2]$
$(c)$ $[Co(en)_3]Cl_3$
$(d)$ $[Pt(NH_3)_4Cl_2]$
$(e)$ $[Pt(NH_3)_2Cl_2]$
$\mathrm{NaOH}+\mathrm{Cl}_{2} \rightarrow(\mathrm{A})+$ side products
(hot and conc.)
$\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Cl}_{2} \rightarrow(\mathrm{B})+$ side products
$(dry)$