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How many of the following liberate colured vapour/gas with concentrated `H_2SO_4` ? `KCl(s)+K_2Cr_2O_7(s),KNO_2(s),Kl(s), KBr(s), KCl(s)` `KBr(s)+MnO_2(s),KNO_3,KCl(s)+MnO_2,K_2SO_3` |
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Answer» Correct Answer - 7 (i)`4Cl^(-)+Cr_2O_7^(2-)+6H^(+)to2CrO_2Cl_2uarr`(deep red) +`3H_2O` (ii)`NO_2^(-)+H^(+)toHNO_2 , 3HNO_2 to HNO_3+Nouarr+H_2O` `2NOuarr+O_2uarr to NO_2uarr`(brown) (iii)`3I^(-)+2H_2SO_4 to I_3^(-)uarr` (violet) +`SO_4^(2-)+2H_2O+SO_2` (iv)`2KBr+2H_2SO_4toBr_2uarr` (reddish brown) +`SO_2uarr+NO_4^(2-)+2K^(+)+2H_2O` (v)`Cl^(-)+H_2SO_4 to HCl uarr` (colourless) + `HSO_4^-` (vi)`2KBr+MnO_2+2H_2SO_4 to Br_2uarr("reddish brown")+ 2K^(+)+Mn^(2+)+2SO_4^(2-)+2H_2O` (vii)`4NO_3^(-)+2H_2SO_4toBr_2uarr("reddish-brown")+2K^(+)+Mn^(2+)+2SO_4^(2-)+2H_2O` (viii)`KCl+MnO(OH)_2+2H_2SO_4+2Cl^(-) ("brown")to Mn^(2+)+Cl_2uarr` (yellowish green) +`2SO_4^(2-)+3H_2O` (ix)`SO_3^(2-)+2H^(+)toSO_2uarr` (colourless) +`H_2O` |
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