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), K I (s), KBr(s), KCl(s)
KBr (s) + MnO 2 (s), KNO 3 , KCI(s) + MnO 2 , K 2 SO 3
Text Solution
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Sol. (i) 4Cl – + Cr 2 O 7 2– + 6H + ⎯→ 2CrO 2 Cl 2 (deep red) + 3H 2 O
(ii) NO 2 – + H + ⎯→ HNO 2 ; 3HNO 2 ⎯→ HNO 3 + NO + H 2 O
2NO + O 2 ⎯→ NO 2 (brown)
(iii) 3I – + 2H 2 SO 4 ⎯→ I 3 – (violet) + SO 4 2– + 2H 2 O + SO 2
(iv) 2KBr + 2H 2 SO 4 ⎯→ Br 2 (reddish brown) + SO 2 + NO 4 2– + 2K + + 2H 2 O
(v) Cl – + H 2 SO 4 ⎯→ HCl (colourless) + HSO 4 –
(vi) 2KBr + MnO 2 + 2H 2 SO 4 ⎯→ Br 2 (reddish-brown) + 2K + + Mn 2+ + 2SO 4 2– + 2H 2 O
(vii) 4NO 3 – + 2H 2 SO 4 ⎯→ NO 2 (brown)
(viii) KCl + MnO(OH) 2 + 2H 2 SO 4 ⎯→ Mn 2+ + Cl 2 (yellowish green) + 2SO 4 2– + 3H 2 O
(ix) SO 3 2– + 2H + ⎯→ SO 2 (colourless) + H 2 O
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