For the coagulation of `200mL` of `As_(2)S_(3)` solution `10mL` of `1 M NaCl` is required. What is the coagulationg value (number of milimoles of solute needed for coagulation of 1 litre of solution) of `NaCl`.

Options

A. 200
B. 100
C. 50
D. 25

Answer

C

Explanation

`10ml` of `1M NaCl` contains `NaCl = 10 xx 1 = 10` milimoles `200ml of As_(2)S_(3)` required `NaCl` for the coagulation `=10 milimo l es`
`:. 1000 ml of As_(2)S_(3)` requried `NaCl` for the coagulation = `10xx1000//200 = 50` milimoles.