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

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

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

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

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

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

6. Maximum oxidation number of manganese is in:

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

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

10. Misch metal is an alloy of:

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

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

13. Which of the following is not an actinoid?

14. The colour of KmnO, is due to:

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

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

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

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

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

20. Shape of d-orbital is: