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$NaI$
$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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$(a)\,B{r_2}(l) \to B{r_2}(g)$
$(b)\,{H_2}O(s) \to {H_2}O(g)$
$(c)\,{N_2}\,\left[ {1\,atm,\,{{100}\,^o}C} \right] \to {N_2}\,\left[ {1\,atm,\,{{150}\,^o}C} \right]$
$(d)\,{N_2}\,(g) + 3{H_2}(g) \to 2N{H_3}(g)$
$(e)\,CaC{O_3}(s) \to CaO(s) + C{O_2}(g)$