12th Chemistry In English

12th Board Exam Chemistry Most VVI Objective Question d Block & f Block Elements Chapter


8. ‘d’ BLOCK AND ‘f’ BLOCK ELEMENTS 


1. Copper is a member of: 

(A) First transition series

(B) Second transition series

(C) Third transition series

(D) Fourth transition series 

Answer :- (A)

2. Oxidation number of gold metal is : 

(A) +1 

(B) 0

(C) -1 

(D) all of these

Answer :- (A)

3. Shape of d-orbital is : 

(A) spherical 

(B) dumb-bell

(C) double dumb-bell

(D) none of these

Answer :- (C)

4. Electronic configuration of alkaline earth element is : 

(A) ns2 

(B) ns1

(C) np6

(D) ns0

Answer :- (A)

5. Outermost configuration 3d64s2k is of :

(A) Ca 

(B) Zn

(C) Mg 

(D) Fe

Answer :- (D)

6. Which one of the following is called green vitriol ? 

(A) FeSO4.7H2

(B) CuSO4.5H2O

(C) CaSO4.2H2

(D) None of these

Answer :- (A)

7. Which block of elements are known as transition elements ? 

(A) p-block 

(B) s-block

(C) d-block 

(D) f-block 

Answer :- (C)

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

(A) Si 

(B) Al

(C) Zn 

(D) Fe 

Answer :- (A)

9. Which one of the following is diamagnetic ion ? 

(A) Co2+ 

(B) Ni2+

(C) Cu2+ 

(D) Zn2+ 

Answer :- (D)

10. Which of the following is not an element of first transition series? 

(A) Iron 

(B) Chromium

(C) Magnesium 

(D) Nickel 

Answer :- (C)

11. Which of the following is not an amphoteric ion ?

(A) A13+ 

(B) Cr3+

(C) Fe2+ 

(D) Zn2+ 

Answer :- (C)

12. When Iron powder is added in CuSOsolution, the blue colour of solution turns : 

(A) Black 

(B) Green

(C) Brown 

(D) Colourless

Answer :- (C)

13. Transition elements are also known as:

(A) s-block elements: 

(B) p-block elements

(C) d-block elements 

(D) p-block elements 

Answer :- (C)

14. The highest magnetic moment shown by the transition metal ion with the outermost electronic configuration is : 

(A) 3d5

(B) 3d2

(C) 3d7

(D) 3d9

Answer :- (A)

15. Transitior elements are 

(A) Metals 

(B) None metals

(C) d-block elements

(D) Gas 

Answer :- (C)

16. Which of the following elements is liquid at room temperature: 

(A) Zn 

(B) Hg

(C) Cu 

(D) Au

Answer :- (B)

17. Which of the following is known as red lead ? 

(A) Pb3O4

(B) Pb2O3

(C) PbO

(D) PbO2

Answer :- (A)

18. Which of the following is not a member of first transition elements series ?

(A) Cr 

(B) Fe

(C) Mg

(D) He

Answer :- (C)

19. Which of the following has the most stable +2 oxidation state?

(A) Sn

(B) Ag

(C) Fe 

(D) Pb 

Answer :- (D)

20. Which metal nitrate gives colorless gas on thermal decomposition 

(A) NaNO3

(B) Cu(NO3)2

(C) Ba(NO3)

(D) Hg(NO3)2

Answer :- (D)

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