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How many of the following liberate coloured vapour/gas with concentrated `H_(2)SO_(4)`? `KCl(s)+K_(2)Cr_(2)O_(7)(s), KNO_(2)(s),Kl(s), KBr(s),KCl(s)` `KBr(s)+MnO_(2)(s),KNO_(3),KCl(s)+MnO_(2),K_(2)SO_(3)` |
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Answer» Correct Answer - 7 (i)`4Cl^(-)+Cr_(2)O_(7)^(2-) +6H^(+) to 2CrO_(2)Cl_(2) uarr ("deep red")+3H_(2)O` (ii)`NO_(2)^(-)+H^(+) to HNO_(2) , 3HNO_(2) to HNO_(3)+NO uarr +H_(2)O` `2NO uarr +O_(2) uarr to NO_(2) uarr` (brown) (iii)`3l^(-)+2H_(2)SO_(4) to l_(3)^(-) uarr ("violet") +SO_(4)^(2-) +2H_(2)O+SO_(2)` (iv)`2KBr +2H_(2)SO_(4) to Br_(2) uarr ("reddish brown")+SO_(2) uarr +NO_(4)^(2-) + 2K^(+) + 2H_(2)O` (v)`Cl^(-)+H_(2)SO_(4) to HCl uarr ("colourless") + HSO_(4)^(-)` (vi)`2KBr + MnO_(2) + 2H_(2)SO_(4) to Br_(2) uarr ("reddish-brown")+2K^(+)+Mn^(2+)+2SO_(4)^(2+) +2H_(2)O` (vii)`4NO_(3)^(-) + 2H_(2)SO_(4) to Br_(2) uarr ("reddish-brown") + 2K^(+) +MN^(2+)+2SO_(4)^(2-) + 2H_(2)O` (viii)`KCl + MnO(OH)_(2) +2H_(2)SO_(4)+2Cl^(-)("brown") to Mn^(2+)+Cl_(2) uarr ("yellowish green") + 2SO_(4)^(2-)+3H_(2)O` (ix)`SO_(3)^(2-) + 2H^(+) to SO_(2) uarr ("colourless") + H_(2)O` |
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