Q8 / 150 · MHT CET 2021 (24 Sep Shift 1) · Chemistry

Identify the compound formed from elements $\mathrm{X}, \mathrm{Y}, \mathrm{Z}$ having oxidation state $+2,+5,-2$ respectively.

  • A
    $\mathrm{X}\left(\mathrm{Y}_4 \mathrm{Z}\right)$
  • Correct answer
    B
    $\mathrm{X}_3\left(\mathrm{YZ}_4\right)_2$
  • C
    $\mathrm{X}_3\left(\mathrm{YZ}_2\right)_2$
  • D
    $\mathrm{XYZ}_2$

Solution

$$ \begin{array}{lll} \mathrm{X}^{+2} & \mathrm{Y}^{+5} & \mathrm{Z}^{-2} \end{array} $$ Overall charge on compound formed by elements X. Y and $\mathrm{Z}$ should be zero. $$ \begin{aligned} & \mathrm{X}_3\left(\mathrm{YZ}_4\right)_2 \Rightarrow 3 \times 2+2 \times 5+8 \times(-2)=0 \\ & \mathrm{X}\left(\mathrm{Y}_4 \mathrm{Z}\right) \Rightarrow 1 \times 2+4 \times 5+1 \times(-2) \neq 0 \\ & \mathrm{X}_3\left(\mathrm{YZ}_2\right)_2 \Rightarrow 3 \times 2+2 \times 5+4 \times(-2) \neq 0 \\ & \mathrm{XYZ}_2 \Rightarrow 1 \times 2+1 \times 5+2 \times(-2) \neq 0 \end{aligned} $$

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

Relevant Questions