The mass numbers of two elements X and Z are 52 and 75 respectively. X contains 16.6% more neutrons compared to protons. Z contains 27.3% more neutrons compared to protons. X and Z are respectively.

Number of protons =x

Number of neutrons =(52-x)

Number of neutrons $=\frac{116.6}{100}\times \mathrm{x}$

$\therefore (52-\mathrm{x})=\frac{116.6}{100}\times \mathrm{x}$

$x=\frac{52}{2.166}=24$

Element x is -(24) C r.

Element (Z): $·{\mathrm{x}}^5\mathrm{Z}$

Number of protons =x

Number of neutrons =(75-x)

Number of neutrons $=\frac{127.3}{100}\times x$

(75-x)=1.273 x

$x=\frac{75}{2.273}=33$

 Element $Z=33\mathrm{As}$

Therefore, Option A is the correct answer.