MCQ
The iron salt used in blue prints is
- A$FeC_2O_4$
- ✓$Fe_2(C_2O_4)_3$
- C$K_4Fe(CN)_6$
- D$FeSO_4$
✓
Answer
Correct option: B.
$Fe_2(C_2O_4)_3$
b
$2CrO_4^{2-} +2H^+ \to Cr_2O_7^{2-} +H_2O$
$2CrO_4^{2-} +2H^+ \to Cr_2O_7^{2-} +H_2O$
$Cr_2O_7^{2-} +2OH^- \to 2CrO_4^{2-} +H_2O$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$IUPAC$ name of the following compound is
→$CH_3-CH=CH-CH_2-C\equiv CH$
The wavelength of an electron of kinetic energy $4.50 \times 10^{-29}\,J$ is $\ldots . . \times 10^{-5}\,m$. (Nearest integer)Given : mass of electron is $9 \times 10^{-31}\,kg , h =6.6 \times$ $10^{-34}\,J s$
→At $298\, K$, the standard reduction potentials are $1.51\, V$ for $MnO_4^ - \,|\,M{n^{2 + }}$, $1.36\, V$ for $C{l_2}\,|\,C{l^ - }$, $1.07\, V$ for $B{r_2}\,|\,B{r^ - }$ and $0.54\, V$ for ${I_2}\,|\,{I^ - }$. At $pH\, = 3$ , permanganate is expected to oxidize $\left( {\frac{{RT}}{F} = 0.059\,V} \right)$
→In $Cr_2O_7^{-2}$ every $Cr$ is linked to
→$pH$ of $10^{-8}\, M$ $Ba(OH)_2$ solution will be
→Which of the following has $p\pi - d\pi $ bonding
→If $ x $ is specific resistance (in $S^{-1}\ cm$ ) of the electrolyte solution and $ y $ is the molarity of the solution, then $ {\Lambda _m} $ (in $ S\ cm^2\ mol^{-1} $) is given by
→For the reaction $3{A_{(g)}}\, + \,{B_{(g)}}\, \rightleftharpoons \,2{C_{(g)}}$ at a given temperature, $K_c$ is $9.0$. What must be the volume of the flask if a mixture of $2.0\, mol$ each of $A, B$ and $C$ is obtained at equilibrium ? .....$L$
→How many functional groups are in following molecule
If spin only magnetic moment of $VCl_X$ is $1.73\,BM$ then correct formula is
→