Which gives + 7 oxidation state ? from Chemistry The d-And-f-Blo

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

61.

The general electronic configuration of the transition elements is

  • (n-1)d10, (n+1)s2

  • (n- 1)d1-10, (n + 1)s1-2

  • (n- 1)d1-10, np6,ns2

  • (n- 1)d1-10, ns1-2


62.

Which of the following ions is colourless in solution?

  • V3+

  • Cr3+

  • Co2+

  • Sc3+


63.

Most common oxidation states of Ce (cerium) are

  • +3, +4

  • +2, +3

  • +2, +4

  • +3, +5


64.

Most basic hydroxide among the following is

  • Lu(OH)3

  • Eu(OH)3

  • Yb(OH)3

  • Ce(OH)3


Advertisement
65.

Most common oxidation states shown by cerium are

  • +2, +4

  • +3, +4

  • +3, +5

  • +2, +3


Advertisement

66.

Which gives + 7 oxidation state ?

  • Mn(25)

  • Cr (24)

  • Cu(29)

  • Fe(26)


A.

Mn(25)

For d- block elements,

Oxidation state = ns electrons + (n - 1)d electrons (unpaired)

a. Mn(25) = [Ar] 3d5 4s2

Oxidation state = 5 + 2 = 7

b. Cr(24) = [Ar] 3d5 4s1

Oxidation state = 5 + 1 = 6

c. Cu(29) = [Ar] 3d10 4s1

Oxidation state = 0 + 1 = 1

d. Fe(26) = [Ar] 3d10 4s1

Oxidation state = + 2 and + 3

Among all the given options, only Mn exhibits + 7 oxidation state.


Advertisement
67.

Which of the following transitions involves maximum amount of energy?

  • M-(g)M(g)

  • M(g) M(g)+

  • M(g)+  M(g)2+

  • M(g)2+ M(g)3+


68.

Select the coloured compound amongst the following .

(At. no. Ti= 22, Cr= 24, Cu= 29, Zn= 30)

  • TiCl4

  • CrCl3

  • ZnCl3

  • CuCl


Advertisement
69.

The only radioactive element among the lanthanoids is

  • gadolinium

  • holmium

  • promethium

  • neodymium


70.

Identify a 'chemical twin' among the following.

  • Zr-Ta

  • Nb-Tc

  • Hf-Re

  • Nb-Ta


Advertisement