TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
Which of the following are correct? (i) First ionisation enthalpy of \(\mathrm{He} < \) Second ionization enthalpy 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 ' \(\mathrm{J}\) '. (v) Francium concentration is \(\sim 10^{-18} \mathrm{ppm}\) on Earth.
- A (i), (ii), (iv)
- B (i), (ii), (iv), (v)
- C (i), (ii), (v)
- D (iv), (v)
Answer & Solution
Correct Answer
(B) (i), (ii), (iv), (v)
Step-by-step Solution
Detailed explanation
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…
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