1.
Which of the following are correct?
(i) First ionisation enthalpy of 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 'J'.
(v) Francium concentration is ~10⁻¹⁸ ppm on Earth.
(i) First ionisation enthalpy of 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 'J'.
(v) Francium concentration is ~10⁻¹⁸ ppm on Earth.
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