Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 48

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For the four successive transion elements $(Cr, Mn, Fe and Co)$ , the stability of $+ 2$ oxidation state will be there in which of the following order?
(At. nos. $Cr = 24, Mn = 25, Fe = 26, Co = 27)$

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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 49

Which one of the following does not correctly represent the correct order of the property indicated against it?

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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 50

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential

(E_{M^{2 +} / M}^{°})

value has a positive sign?

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Alpha Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>Exercise 2>Q 51

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

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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

4 f

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?