MCQ
Which of the following solid salt on heating with solid $K_2Cr_2O_7$ and conc. $H_2SO_4$ orange red vapours are evolved which tum aquous $NaOH$ solution yellow ?
- A$NaBr$
- ✓$NaCl$
- C$NaNO_3$
- D$NaI$
✓
Answer
Correct option: B.
$NaCl$
b
$NaC{l_{\left( s \right)}} + {K_2}C{r_2}{O_7}_{\left( s \right)} + {H_2}S{O_4}$ $\left( {{\text{few drop}}} \right)\xrightarrow[{reaction}]{{Non - redox}}$ $\mathop {Cr{O_2}C{l_2}}\limits_{\left( {orange{\kern 1pt} red{\kern 1pt} vapours} \right)} {\mkern 1mu} \uparrow + HO$
$NaC{l_{\left( s \right)}} + {K_2}C{r_2}{O_7}_{\left( s \right)} + {H_2}S{O_4}$ $\left( {{\text{few drop}}} \right)\xrightarrow[{reaction}]{{Non - redox}}$ $\mathop {Cr{O_2}C{l_2}}\limits_{\left( {orange{\kern 1pt} red{\kern 1pt} vapours} \right)} {\mkern 1mu} \uparrow + HO$
$Cr{O_2}C{l_2} + OH_{\left( {aq} \right)}^ - $ $\to $ $\mathop {CrO_{4\left( {aq.} \right)}^{2 - }}\limits_{Yellow{\kern 1pt} solution} {\mkern 1mu} + C{l^ - } + 2{H_2}O$
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