When concentrated $H_2SO_4$ is heated with $KNO_3$,brown fumes are evolved. These fumes are due to:

  • A
    $SO_2$
  • B
    $SO_3$
  • C
    $NO_2$
  • D
    $NO$

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$A + O_2 \to B$ ;
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How many $P-O-P$ linkages are there in $P_4O_{10}$?

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