Verified Solution • 2025–26 Session moderate

QNEET-2017-Ch-948: NEET 2017 Chemistry - Class 12 NEET-2017-Ch-948 Solution: Correct increasing order for the wavelengths of absorption in…

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+Co^{3+} is [Co(H2O)6]3+[Co(en)3]3+[Co(NH3)6]3+[Co(H_2O)_6]^{3+} [Co(en)_3]^{3+} [Co(NH_3)_6]^{3+} [Co(H2O)6]3+[Co(NH3)6]3+[Co(en)3]3+[Co(H_2O)_6]^{3+} [Co(NH_3)_6]^{3+} [Co(en)_3]^{3+} [Co(NH3)6]3+[Co(en)3]3+[Co(H2O)6]3+[Co(NH_3)_6]^{3+} [Co(en)_3]^{3+} [Co(H_2O)_6]^{3+} [Co(en)3]3+[Co(NH3)6]3+[Co(H2O)6]3+[Co(en)_3]^{3+} [Co(NH_3)_6]^{3+} [Co(H_2O)_6]^{3+}

Multiple Choice Options

  • A [Co(H 2 O) 6 ] 3+ , [Co(en) 3 ] 3+ , [Co(NH 3 ) 6 ] 3+
  • B [Co(H 2 O) 6 ] 3+ , [Co(NH 3 ) 6 ] 3+ , [Co(en) 3 ] 3+
  • C [Co(NH 3 ) 6 ] 3+ , [Co(en) 3 ] 3+ , [Co(H 2 O) 6 ] 3+
  • D [Co(en) 3 ] 3+ , [Co(NH 3 ) 6 ] 3+ , [Co(H 2 O) 6 ] 3+

Step-by-Step Verified Solution

Increasing order of wavelength of absorption is _ 0 = en > NH 3 > H 2 _ 0 = E = h c _ Thus, increasing order of wavelength of absorption is: [Co(en) 3 ] 3+ < [Co(NH 3 ) 6 ] 3+ < [Co(H 2 O) 6 ] 3+

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