Block D and F Elements

Which complex compound is most stable?

Given below are two statements:
Statement I: The nutrient deficient water bodies lead to eutrophication.
Statement II: Eutrophication leads to decrease in the level of oxygen in water bodies.

In the light of the above statements, choose the correct answer from the options given below:

The stability of Cu²⁺ is more than Cu⁺ salts in aqueous solutions due to:

Given below are two statements:
Statement I: The E° value for Ce? / Ce³? is + 1.74V
Statement II: Ce is more stable in Ce? state than Ce³? state
In the light of the above statements, choose the most appropriate answer from the options given below:

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:

In the above reactions, the enzyme A and enzyme B respectively are:
C₁₂H₂₂O₁₁ (Sucrose) + H₂O --(Enzyme A)--> C₆H₁₂O₆ (Glucose) + C₆H_12O6 (Fructose)
C₆H₁₂O₆ --(Enzyme B)--> 2C₂H₅OH + 2CO₂

Given below are two statements:
Statement I: 2-methylbutane on oxidation with KMnO4 gives 2-methylbutan-2-ol.
Statement II: n-alkanes can be easily oxidised to corresponding alcohols with KMnO4.
Choose the correct option:

Compound with molecular formula C?H?O can show:

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

The correct electronic configuration and spin - only magnetic moment (BM) of Gd³⁺ (Z = 64), respectively, are: