Identify the correct pair:

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(B) In the context of wastewater treatment and environmental pollution control:$1$. Colloidal materials are very fine particles that do not settle eas

Vedclass · Accepted Answer

Suspended solids - Paper fibres

Vedclass · Answer

(B) In the context of wastewater treatment and environmental pollution control:$1$. Colloidal materials are very fine particles that do not settle easily,such as fecal matter,bacteria,and fine silt,not cloth.$2$. Suspended solids include materials like sand,silt,and clay,but also organic matter like paper fibres,which can be removed by filtration or sedimentation.$3$. $A$ catalytic converter is used in automobiles to reduce toxic gas emissions ($CO$,$NO_x$,and hydrocarbons),not in electrostatic precipitators.$4$. Dissolved materials include nutrients like nitrates,phosphates,and salts,not sand (which is a suspended solid).Therefore,the correct pair is $B$.

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