The function of $Fe(OH)_{3}$ in the contact process is

  • A
    to remove arsenic impurity
  • B
    to detect colloidal impurity
  • C
    to remove moisture
  • D
    to remove dust particles

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Which of the following statements is $NOT$ true about lyophilic colloids?

Match the following types of colloidal systems in List-$I$ with their corresponding names in List-$II$.
List-$I$List-$II$
$(A)$ Solid dispersed in liquid$(I)$ Emulsion
$(B)$ Liquid dispersed in liquid$(II)$ Foam
$(C)$ Gas dispersed in liquid$(III)$ Gel
$(D)$ Liquid dispersed in solid$(IV)$ Sol
$(V)$ Aerosol

Which one of the following does not involve coagulation?

What improvement can you suggest in the Hardy-Schulze rule?

In the measurement of gold number,the useful electrolyte is

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