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

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

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

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

4. Maximum oxidation number of manganese is in:

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

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

7. 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+

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

9. Misch metal is an alloy of:

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

11. Which of the following is not an actinoid?

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

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

14. The colour of KmnO, is due to:

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

16. Shape of d-orbital is:

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

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

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

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