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 geometry of Ni(CO)₄ and [Ni(P Ph₃)₂] are

Of the following which is diamagnetic in nature?

The [Fe(CN)₆]^3– complex ion

50 ml of 0.2 M solution of a compound with empirical formula CoCl₃.4NH₃ on treatment with excess of AgNO_3(aq) yields 1.435 g of AgCl. Ammonia is not removed by treatment with concentrated H₂SO₄. The formula of the compound is : 

When MnO₂ is fused with KOH, a coloured compound is formed. The product and its colour are

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

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