Question

 

Of the ions Zn2+, Ni2+ and Cr3+,

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

Solution

Correct option is

Only Zn2+ is colourless and Ni2+ and Cr3+ are coloured

Ni2+ and Cr2+ are coloured due to presence of unpaired elecrrons. But Zn2+ is colourless because of absence of unpaired electrons.

SIMILAR QUESTIONS

Q1

Which of the following is called white vitriol?

Q2

Nessler’s reagent is

Q3

Coinage metals show the properties of

Q4

Which of the following elements does not belong to the first transition series?

Q5

Zinc does not show variable valency like d-block elements because

Q6

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

Q7

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

Q8

Cuprous ion is colourless, while cupric ion is coloured because

Q9

In which of the following metallic bond is strongest?

Q10

Which of the following ions has the highest magnetic moment?