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
    $H_3PO_5$ is a stronger acid than $H_2SO_3$.

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What is the number of oxygen atoms attached to each phosphorus atom in $P_4O_{10}$?

Which of the following is used to obtain $Ag$ from $AgNO_3$?

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$P_4 + 3NaOH + 3H_2O \to A + 3NaH_2PO_2$. Here,$A$ is:

Give the correct characteristic colours of the products $(P, Q, R, S)$ formed in the following reactions:
$(A)\ NO + NO_2 \xrightarrow{< 250 K} P$
$(B)\ 2 NO_2 \longleftrightarrow Q$
$(C)\ Pb(NO_3)_2 \xrightarrow{673 K} R + PbO$
$(D)\ 4 HNO_3 + P_4O_{10} \longrightarrow S + 4 HPO_3$

Which of the following oxides is diamagnetic?

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