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

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

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

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

4. The colour of KmnO, is due to:

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

6. Maximum oxidation number of manganese is in:

7. Shape of d-orbital is:

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

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

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

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

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

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

16. Misch metal is an alloy of:

17. Which of the following is not an actinoid?

18. 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+

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

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