Concentrated sulphuric acid is added followed by heating of each of the following test tubes labelled (i) to Which of the following statement is incorrect about these observations ?

Concentrated sulphuric acid is added followed by heating of each of th

1.	Concentrated sulphuric acid is added followed by heating of each of the following test tubes labelled (i) to Which of the following statement is incorrect about these observations ?
Answer» Evolution of reddish brown GAS take place in (ii) test tube and black substance is formed in (i) test tube Evolution of reddish brown gas take place in (iii) test tube and blue solution is formed Evolution of neutral COLOURLESS gas take place in (iv) test tube and gas burns with blue flame Evolution of YELLOWISH green gas take place in (v) test tube and colourless solution is formed Solution :(i)`C_12H_22O_11underset("DEHYDRATION")overset(Conc. H_2SO_4)12C (black)+11H_2O` (ii)`2NaBr+2H_2SO_4 to Na_2SO_4 + SO_2+Br_2 uarr` (reddish brown) +`2H_2O` (iii)`2Cu(NO_3)_2+2H_2SO_4to2CuSO_4` (blue solution) +`4NO_2 uarr` (reddish brown) +`O_2+2H_2O` (iv)`K_4[FE(CN)_6]+6H_2SO_4+6H_2Oto2K_2SO_4+FeSO_4+3(NH_4)_2SO_4+6COuarr`(neutral and colourless ) Co burns with blue flame. (v)`KCl+H_2SO_4 to KHSO_4 + HCl uarr` (colourless)