MCQ
$B{r_2}$ gas turns starch iodide paper
  • Blue
  • B
    Red
  • C
    Colourless
  • D
    Yellow

Answer

Correct option: A.
Blue
a
The bromine releases iodine from the potassium iodide Iodine reacts with starch to produce a blue color.

$Br _2+ KI \rightarrow KBr + I _2$

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Similar questions

Match list $-I$ with list $-II$ and then select the correct answer from the codes given below that list

                                  List $-I$

$(A){\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {C_6}{H_6} + CO + HCl\,\xrightarrow{{AlC{l_3}}}\,{C_6}{H_5}CHO$

$(B){\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {C_6}{H_5} + C{H_3}$ $\xrightarrow{{Cr{O_2}C{l_2}}}\,{C_6}{H_5}CHO$

$(C){\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {C_6}{H_5}C{H_2}Br\, + \,C{H_3}Br$ $\xrightarrow{{Na/ether}}\,{C_6}{H_5}C{H_2}C{H_3}$

$(D){\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {C_6}{H_6}\, + \,{(C{H_3})_2}C = C{H_2}$ $\xrightarrow{{{H_2}S{O_4}}}\,{C_6}{H_5}C{(C{H_3})_3}$

                                 List $-II$
$(a)$   Friedel-Crafts reaction
$(b)$   Wurtz-Fitting reaction
$(c)$   Gattermann-Koch Aldehyde synthesis
$(d)$   Etard’s reaction

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