Which of the following statements is not true in regard to transition elements?

The catalytic activity of the transition metals and their compounds is ascribed to their

Cuprous ion is colourless, while cupric ion is coloured because

Of the ions Zn²⁺, Ni²⁺ and Cr³⁺,

(atomic number of Zn = 30, Ni = 28, Cr = 24)

In which of the following metallic bond is strongest?

Which of the following ions has the highest magnetic moment?

Which of the following elements has the maximum first ionization potential?

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

When metallic copper comes in contact with moisture, a green powder/pasty coating can be seen over it. This is chemically known as

One of the product formed when K₂Cr₂O₇ reacts with conc H₂SO₄ in cold is