Which of the following statements is $NOT$ consistent for transition elements?

  • A
    Transition elements have high melting points.
  • B
    Some ions of transition elements exhibit paramagnetic properties.
  • C
    All transition elements dissolve in acids.
  • D
    Transition elements exhibit variable valency.

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$I$. $Na_2Cr_2O_7 + X \xrightarrow{\Delta} Cr_2O_3$
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$\underset{\text{coloured}}{P(\text{soln.})}$ $\xrightarrow{\text{Air}} \underset{\text{coloured}}{Q(\text{soln.})}$ $\xrightarrow{KOH} R \downarrow$
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