1.Which of the following is not a chelating agent? EDTA Ethylene diamine Oxalate

Question

1.Which of the following is not a chelating agent?

EDTA
Ethylene diamine
Oxalate ion
Cyanide ion
Porphine


I think it is EDTA but I am not sure.

2.How many valence electrons are there in a Mo atom?

4
6
8
36
42

Is it 6?

3. Which of the following will have five d electrons associated with the central metal?

V (atom)
[Fe(CN)6]3-
[Fe(CN)6]4-
MnO2
[Co(NH3)6]3+

4. Which of the following are expected to exhibit acid behavior in aqueous solution?

I. Al(NO3)3
II. CO2
III. CaO
IV. Tl2O

I only
II only
III and IV only
I and II only
I, II and IV

5. Which of the following oxides would be amphoteric? B2O3, Al2O3, GeO2, Tl2O, Sb2O5?

B2O3
Al2O3
GeO2
Tl2O
Sb2O5

Explanation / Answer

1.Which of the following is not a chelating agent? Cyanide ion 2.How many valence electrons are there in a Mo atom? 6 Is it 6? yes 3. Which of the following will have five d electrons associated with the central metal? [Fe(CN)6]3- 4. Which of the following are expected to exhibit acid behavior in aqueous solution? I. Al(NO3)3 II. CO2 III. CaO IV. Tl2O I and II only 5. Which of the following oxides would be amphoteric? B2O3, Al2O3, GeO2, Tl2O, Sb2O5? Al2O3

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