The d-and f-Block Elements Class 12 MCQs Questions with Answers

1. Maximum oxidation number of manganese is in:

2. CuSO4. 5H2O is blue is colour because:

3. One mole of acidfied K2Cr3+O on reaction with excess KI will liberate ………….. mole(s) of I2:

4. Which of the following factor may be regarded as the main cause of lanthanide contraction?

5. Colour of transition metal ions are due to absorption of some wavelength. This results in:

6. Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is:

7. Which of the following is not an actinoid?

8. When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is:

9. In a given shell, The order of screening effect is:

10. According to IUPAC nomenclature sodium nitroprusside dihydrate is named as:

11. Anomalous electronic configuration in the 3d series are of:

12. Misch metal is an alloy of:

13. The radius of La3+ (At. No. of La = 57) is 1.06 A°. Which one of the following given values will be closest to the radius of Lu3+

14. The colour of KmnO, is due to:

15. Shape of d-orbital is:

16.  Which of the following products are obtained when Na2CO3 is added to a solution of copper sulphate?

17. The stability of Mn2+, Fe2+, Cr2+, Co2+ is in order of (At No. of Mn = 25, Fe = 26, Cr = 24, Co = 27):

18. The melting point of copper is higher than that of zinc because:

19. Most abundant element in earth’s crust is:

20. Which one of the following characteristics of the transistion metals is associated with higher catalytic activity?