Q29 / 160 · AP EAMCET 2023 (19 May Shift 1) · Chemistry

Identify the correct statement

  • A
    $\mathrm{Yb}^{2+}$ is an oxidant
  • B
    $\mathrm{Lu}^{3+}$ is paramagnetic
  • Correct answer
    C
    $\mathrm{CrO}$ is basic
  • D
    Brass is an alloy of $\mathrm{Cu}, \mathrm{Sn}$

Solution

$\mathrm{Yb}^{2+}=[\mathrm{Xe}] 4 \mathrm{f}^{14}$ Thus, it prefers to lose one electron as shielding is strong and it can form $\mathrm{Yb}^{3+}$ so it acts as a reductant. $\mathrm{Lu}^{3+}=[\mathrm{Xe}] 4 \mathrm{f}^{14}$ so it is diamagnetic. $\mathrm{CrO}$ is basic in its low oxidation state of +2 and prefers to attain a state of +6 . Brass $=\mathrm{Cu}+\mathrm{Zn}$ and $\mathrm{Bronze}=\mathrm{Cu}+\mathrm{Sn}$

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

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