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The catalytic activity of transition metals and their compounds is ascribed mainly to : 

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Important Questions on The d- and f-Block Elements

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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 52

Which of the following, exhibit only +3 oxidation state?

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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 53
Which of the following lanthanoid ions is diamagnetic? (At nos. Ce=58, Sm=62, Eu=63, Yb=70)
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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 54
Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 55

The reason for the greater range of oxidation states in actinoids is attributed to _____.

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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 56
Which of the following is an amphoteric oxide?
 
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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 57
Most common oxidation states of Ce (cerium) are
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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 58
Cerium (Z=58) is an important member of lanthanides. Which of the following statements about cerium is incorrect?
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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 60
The "spin-only" magnetic moment [in units of Bohr magneton, μ] of Ni2+ in an aqueous solution would be (Atomic number of Ni=28):