Multiple Choice QuestionsThe aqueous ferrous ion is green, ferric ion is pale yellow. The aqueous chromic ion is green, hence the colour of chromate ion must be
orange
colourless
yellow
red
C.
yellow
Most of the compounds of transition metals are coloured in solid as well as solution state. Colour in transition metal ions is usually due to electron transition within the d-shell. Intensely coloured ions with the metal in its highest oxidaton state (e.g., Mn7+, Cr6+, Fe6+) derive the colour from electrons transitions between the metal and the oxygen atom.
Iron:
(i) Fe2+ is green.
(ii) Fe3+ is pale yellow in colour.
Chromium : The colour of chromic ion, i.e., Cr3+ depends around the ligand around the ion. Aqueous solution contains the violet octahedral hexaaquachromium (III) ion, but when some of the water ligands are replaced by other species, such Cr3+ ions are green.
In chromate ion (CrO), Cr occurs in +6 oxidation state and it is yellow in colour.
belongs to IIIB group of the Periodic.When it loses one α -particle, the new element will belong to the group.
I B
V B
I A
III B
Which set of elements have nearly the same atomic radii ?
F, Cl, Br, I
Na, K, Rb, Cs
Fe, Co, Ni, Cu
Li, Be, B, C
When MnO2 is heated with PbO2 and conc. HNO3 pink colour is obtained due to formation of
KMnO4
HMnO4
Pb(MnO4)2
PbMnO2
In nitroprusside ion, the iron and NO as Fe2+ and NO+ rather than Fe3+ and NO. These forms can be differentiated by
estimating the concentration of iron
measuring the concentration of CN-
measuring the solid state magnetic moment
thermally decomposing the compound
Which of the following compounds gives PELIGOT's salt with chromyl chloride?
Borax
Oxone
Sylvine
Trona
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