Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Size of Bk3+ ion is less than Np3+ ion. Reason R : The above is a consequence of the lanthanoid contraction. In the light of the above statements, choose the correct answer from the options given below :

Fex2 and Fey3 are known when x and y are :

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers Ce = 58, Gd = 64 and Eu = 63) (a) (NH4)2[Ce(NO3)6] (b) Gd(NO3)3 and (c) Eu(NO3)3

What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it's aqueous solution?

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 :

The common positive oxidation states for an element with atomic number 24, are :

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 set having ions which are coloured and paramagnetic both 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

The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are : (At.No. Sc : 21, Ti : 22, V : 23)

Which one of the following metals forms interstitial hydride easily?

Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :

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

Potassium permanganate on heating at 513 K gives a product which is :

In the structure of the dichromate ion, there is a :

Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)

The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively : 5Fe2+ + MnO$${}_4^{-}$$ + 8H+ $$\to$$ Mn2+ + 4H2O + 5Fe3+