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Identify a 'Chemical twin' among the foo...

Identify a 'Chemical twin' among the foolowings.

A

Zr-Ta

B

Nb-Tc

C

Hf-Re

D

Nb-Ta

Text Solution

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The correct Answer is:
D
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TARGET PUBLICATION-D AND F-BLOCK ELEMENT -COMPETITIVE THINKING
  1. Because of lanthnoid contraction, which of the following pairs of elem...

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  2. Which of the following pairs has the same size ?

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  3. Identify a 'Chemical twin' among the foolowings.

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  4. Which of the following statement(s) is/are incorrect for pair of elem...

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  5. Which of the following is NOT an actinide?

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  6. The actinoids exhibit more number of oxidation states in general than ...

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  7. The reason for greater range of oxidation state in actinoids is attrib...

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  8. The only radioactive element among the lanthanoids is

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  9. Identify the INCORRECT statement among the following.

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  10. Which is not the correct statement about the chemistry of 3d and 4f se...

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  11. An element in +2 oxidation state has the electronic configuration [Ar]...

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  12. In context with the transition element, which of the following stateme...

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  13. Iron exhibits +2 and +3 oxidation states. Which of the following state...

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  14. The basic character of the transition metal monoxide follows the order

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  15. All the following statements about the transitional elements are true ...

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  16. Which statement is NOT correct?

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  17. Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 ...

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  18. The CORRECT statement is .

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  19. Which of the following is a transition element as per the ground state...

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  20. Which of the following oxide has the maximum basicity?

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