Question

which will show tyndall effect

Answer 1

This is because colloids have suspension of small particles, from 1 – 1000 nanometres in size which canscatter light falling on them, a phenomenon called as Tyndall effect. In the above question, only b) milk and d) starch solution show Tyndall effectas they are colloids.

Answer 2

Hey !!

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Generally,

The Colloid Solutions have their particle range between 1 - 1000 Nanometers

They, Neither Mix/dissolve with liquid nor, settle down at bottom

Hence, 

This Makes Them To allow the light path to be shown

This Phenomenon is also called Tyndall Effect

Hence,

Only Colloidal Solutions Show Tyndall Effect

Example : Milk

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Hope This Helps...!!!