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Reason of lanthanoid contraction is:-

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Important Questions on The d- and f-Block Elements

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 36
Identify the alloy containing a non-metal as a constituent in it. 
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 37
The colour imparted by Co(II) compounds to glass is -
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 38
Which of the following does not give oxygen on heating?
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 40
The correct order of ionic radii of Y3+, La3+, Eu3+, Lu3+ is
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 41
Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is 
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 42
The aqueous solution containing which one of the following ions will be colourless?
(Atomic number: Sc = 21, Fe = 26. Ti = 22, Mn = 25)
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 43
The lanthanoid contraction is responsible for the fact that
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 44

Which one of the following nitrate will leave behind a metal on strong heating