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p -Block elements - ll — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Correct statement regarding halogen is/are
  • A
    Normally interhalogen compounds are more reactive than fluorine
  • ✓
    Oxidising power order $HClO_4 > HClO_3 > HClO_2 > HClO$
  • C
    Chlorine shows bleaching action by reducing coloured substance
  • D
    Stability order of oxides $I > Cl > Br$
✓

Answer

Correct option: B.
Oxidising power order $HClO_4 > HClO_3 > HClO_2 > HClO$
b
Both Assertion and Reason are true but reason is not the correct explanation of assertion. Greater the number of negative atoms present in the oxy-acid make the acid stronger. In general, the strengths of acids that have general formula $(HO)_m$ $ZO_n$ can be related to the value of $n$. As the value of $n$ increases, acidic character also increases. The negative atoms draw electrons away from the $Z-$ atom and make it more positive. The $Z-$ atom, therefore, becomes more effective in withdrawing electron density away from the oxygen atom that bonded to hydrogen. In turn, the electrons of $H -O$ bond are drawn more strongly away from the $H-$ atom. The net effect makes it easier from the proton release and increases the acid a strength

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