Q30 / 160 · AP EAMCET 2018 (22 Apr Shift 2) · Chemistry

Identify the correct statements from the following. (i) $\mathrm{Eu}^{2+}$ and $\mathrm{Yb}^{2+}$ are reducing agents. (ii) The electronic configuration of $\mathrm{Pr}^{3+}$ is $[\mathrm{Xe}] 4 f^3$. (iii) Aqueous solution of $\mathrm{LaCl}_3$ is colourless.

  • A
    (i), (ii), (iii)
  • Correct answer
    B
    (i), (iii)
  • C
    (i), (ii)
  • D
    (ii), (iii)

Solution

(a) $\mathrm{Eu}^{2+}$ and $\mathrm{Yb}^{2+}$ can lose electrons and form $\mathrm{Eu}^{3+}$ and $\mathrm{Yb}^{3+}$. So, act as reducing agents. (c) in the aqua solution of $\mathrm{LaCl}_3$ it forms colourless solution.

Hence, the correct answer is option: 'B'.

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