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Which of the following ion does not exist?

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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 6
Magnetic moment 2.84 B.M. is given by :(At. nos, Ni=28, Ti=22, Cr=24, Co=27) 
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 7
Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Number in the parenthesis are atomic numbers).
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 8
Highly unstable species 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 9
Which of the following is diamagnetic
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 10

Which one of the following statements is CORRECT when SO2 is passed through acidified K2Cr2O7 solution?

 

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 11
Which one of the following statements related to lanthanons is incorrect?
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 12
Which of the following is ferromagnetic :-
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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-II (Previous Year Questions)>Q 13
Aquaregia convert :-