Multiple choice

Which of the following sets of ions does not give coloured solution?

  1. Cu+, Nb+5 and Cu+2

  2. Ir+4, Mo+4 and Y+3

  3. Ta+5, W+2 and Zn+2

  4. Cr+6, Pt+4 and Re+7

  5. Zr+4, Hf+4 and Os+8
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This option is correct because the compounds which do not have d-electrons or have filled (n-1)d orbitals (d10) are colourless. Zr+4, Os+8 and Hf+4 have vacant d-orbital (d0), so all are colourless.

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