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Which of the following are correct ? ...

Which of the following are correct ?
(i) First ionisation enthalpy of He `lt ` second ionization euthalpy of Li.
(ii) Li has the highest second ionisation enthalpy.
(iii) All d-block elements are transition elements.
(iv) The only alphabet not found in the periodic table is the letter 'J'
(v) Francium concentration is `!10 ^(-18)` ppm on Earth.

A

`(i), (iii),(iv)`

B

`(i), (ii),(iv), (v)`

C

`(i),(ii),(v)`

D

`(iv),(v)`

Text Solution

Verified by Experts

The correct Answer is:
B
All transition elements are d-block elements but all d-block elements are not transition metals. A transition metal is one which forms one or more stable ions which have incomplete d-orbitals. On the basis of this definition, scandium and zinc do not count as transition metal although they are d-block elements.
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