Q30 of 43 Page 258

The oxidation number of cobalt in K[Co(CO)4] is

(i) + 1 (ii) + 3 (iii) –1 (iv) –3

K[Co(CO)4] = K + + [Co(CO)4]-

total overall charge as 0:


X + 4(0) = -1


X = -1.


Option (iii) is correct.


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How many ions are produced from the complex Co(NH3)6Cl2 in solution?

(i) 6 (ii) 4 (iii) 3 (iv) 2

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Amongst the following ions which one has the highest magnetic moment value?

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Amongst the following the most stable complex is

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(iii) [Fe(C2O4)3]3-


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What will be the correct order for the wavelength of absorption in the visible region for the following: [Ni(NO2)6]4-, [Ni(NH3)6]2+, [Ni(H2O)6]2+