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NTA Abhyas JEE Main2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Practice

Pick out the incorrect statement regarding halogens.

Options

  1. AChlorine is hydrolysed by water to form hydrochloric acid and hypochlorous acid
  2. BBromine and iodine react with NaOH solution to form halide and halate ion
  3. CChlorine reacts with cold dilute NaOH solution to give sodium chloride and sodium chlorate
  4. DIodine forms a deep blue colour with starch solution

Correct answer

C. Chlorine reacts with cold dilute NaOH solution to give sodium chloride and sodium chlorate

Step-by-step solution

C l 2 reacts with cold dilute NaOH solution to form NaCl and NaOCl. 2 N a O H + C l 2 → N a C l + N a C l O + H 2 O C l 2 form s NaCl and N a C l O 3 only above 75 ° C 6 N a O H + 3 C l 2 → 5 N a C l + N a C l O 3 + 3 H 2 O A. C l 2 a q + 2 H 2 O ⇌ H 3 O + + C l - + H O C l B. 6 N a O H + 3 X 2 → 5 N a X + N a X O 3 + 3 H 2 ; X = B r , I D. It is thought that I 2 molecules reside inside the spiral structure of starch molecule giving deep blue colour.

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