Carbonyls In emerald [Fig. . (b)], Cr ions occupy octahedral sites in the mineral beryl (Be Al Si O ). The absorption bands seen in the ruby shift to longer wavelength, namely yellow-red and blue, causing emerald to transmit light in the green region.
Fig. . : (a) Ruby: this gemstone was found in marble from Mogok, Myanmar; (b) Emerald: this gemstone was found in Muzo, Columbia. (a) (b) .
Explain on the basis of valence bond theory that [Ni(CN) ] – ion with square planar structure is diamagnetic and the [NiCl ] – ion with tetrahedral geometry is paramagnetic. . [NiCl ] – is paramagnetic while [Ni(CO) ] is diamagnetic though both are tetrahedral. Why?
. [Fe(H O) ] + is strongly paramagnetic whereas [Fe(CN) ] – is weakly paramagnetic. Explain. .
Explain [Co(NH ) ] + is an inner orbital complex whereas [Ni(NH ) ] + is an outer orbital complex. . Predict the number of unpaired electrons in the square planar [Pt(CN) ] – ion. .
The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.