D and F Block Elements

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

Which one of the following nitrates will leave behind a metal on strong heating?

Excess of KI reacts with CuSO₄ solution and then Na₂S₂O₃ solution is added to it. Which of the statements is incorrect for this reaction?

The oxidation state of chromium in the final product formed the reaction between $$K{\rm I}$$ and acidified potassium dichromate solution is :

Amount of oxalic acid present in a solution can be determined by its titration with $$KMn{O_4}$$ solution in the presence of $${H_2}S{O_4}.$$ The titration gives unsatisfactory result when carried out in the presence of $$HCl,$$ because $$HCl$$ :

The colour of KMnO₄ is due to :

Wilkinson catalyst is : (Et = C₂H₅)

In context of the lanthanoids, which of the following statements is not correct?

The outer electron configuration of $$Gd$$ (Atomic No. $$64$$) is :

$$\underline A \,\,\buildrel {4KOH,{O_2}} \over \longrightarrow \,\,\mathop {2\underline B }\limits_{\left( {Green} \right)} \,\, + \,\,2{H_2}O$$ $$3\underline B \,\,\buildrel {4HCl} \over \longrightarrow \,\,\mathop {2\underline C }\limits_{\left( {Purple} \right)} \,\, + \,\,Mn{O_2} + 2{H_2}O$$ $$2\underline C \,\,\buildrel {{H_2}O.KI} \over \longrightarrow \,\,\mathop {2\underline A }\limits_{\left( {Purple} \right)} \,\, + \,\,2KOH\,\, + \,\,\underline D$$ In the above sequence of reactions, $${\underline A }$$ and $${\underline D }$$, respectively, are :

5 g of zinc is treated separately with an excess of (a) dilute hydrochloric acid and (b) aqueous sodium hydroxide. The ratio of the volumes of H₂ evolved in these two reactions is :

The incorrect statement is :

Fex₂ and Fey₃ are known when x and y are :

Given below are two statements : Statement I : Potassium permanganate on heating at 573K forms potassium manganate. Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature. In the light of the above statements, choose the most appropriate answer from the options given below :

Match List - I with List - II List - I List - II (a) Chlorophyll (i) Ruthenium (b) Vitamin-$${B_{12}}$$ (ii) Platinum (c) Anticancer drug (iii) Cobalt (d) Grubbs catalyst (iv) Magnesium Choose the most appropriate answer from the options given below :

The oxide that shows magnetic property is :

The correct order of following 3d metal oxides, according to their oxidation numbers is : (a) CrO₃, (b) Fe₂O₃, (c) MnO₂, (d) V₂O₅, (e) Cu₂O

Which one of the following metals forms interstitial hydride easily?

The addition of dilute NaOH to Cr³⁺ salt solution will give :