Which of the following statements is correct?

  • A
    $HF$ is a stronger acid than $HCl$ in aqueous medium.
  • B
    $HClO_4$ is a weaker acid than $HClO_3$.
  • C
    $HNO_3$ is a stronger acid than $HNO_2$.
  • D
    $H_3PO_3$ is a stronger acid than $H_2SO_3$.

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The conjugate base of phosphorus acid is $x$. The conjugate base of oleum is $y$. What are $x$ and $y$,respectively?

Which of the following is not a Lewis base?

Classify the following species into Lewis acids and Lewis bases and show how these act as Lewis acid/base:
$(a) OH^{-}$
$(b) F^{-}$
$(c) H^{+}$
$(d) BCl_{3}$

The conjugate acid of $S_2O_8^{2-}$ is

The compound that is not a Lewis acid is

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