Which Of The Following Statements Is Not Ture?

In the process of extraction of gold, 

; 

[x] and [y] are :

Which is diamagnetic and Which is paramagnetic amongest [Ni(CO)₄], [Ni(CN)₄]^2– and [NiCl₄]^2–

Which of the following is non-conducting?

Aqueous solution of FeSO₄ gives tests for both Fe²⁺ and  but after addition of excess of KCN, solution ceases to give test for Fe²⁺. This is due to of the formation

Which of the following statement(s) is/are correct with reference to Fe²⁺and Fe³⁺ ions?

(i) Fe³⁺ gives brown colour with potassium ferricyanide 

(ii) Fe²⁺ gives blue colour with potassium ferricyanide 

(iii) Fe³⁺ gives red colour with potassium thiocyanate

(iv) Fe²⁺ gives brown colour with ammonium thicyanate

The disodium salt of ethylenediamine tetra acetic acid can be used to estimate the following ion(s) in the aqueous solution

[Cu(NH₃)₄]²⁺ has hybridisation and magnetic moment

[FeF₆]^3– has Fe atom …. hybridized with unaired ….. electrons

Which of the following statements about Fe(CO)₅ is correct?

The increasing order of paramegnatism of

(i) MnSO₄.4H₂O                       (ii) FeSO₄.7H₂O 

(iii) NiSO₄.6H₂O and                (iv) CuSO₄.5H₂O