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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Correct order of acidic strength
  • A
    $HF > HCl > HBr > HI$
  • ✓
    $H_3PO_2 > H_3PO_3 > H_3PO_4$
  • C
    $B(OH)_3 > H_2CO_3 > HNO_3$
  • D
    $H_2O > H_2S > H_2Se > H_2Te$
✓

Answer

Correct option: B.
$H_3PO_2 > H_3PO_3 > H_3PO_4$
b
Substance can acts as both oxidizing as well as reducing agent when a metal atom is present in its intermediate step.

$O _3$ can acts as only oxidizing agent due to its unstable nature and decomposes to give nascent oxygen.

$HNO _3$ : Nitrogen is present in its highest oxidation state i.e., $+5$ so it can act as only oxidizing agent.

$SO _2$ :Sulphur is present in $+4$ oxidation state so it can act as both oxidizing as well as reducing agent.

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