The particles in various forms are visible only under an ultramicroscope. A solution containing such particles is called:

true solution

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colloidal solution

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saturated solution

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heterogeneous solution

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Solution

The correct option is B colloidal solution
The particle size of a true solution is less than $1 n m$ in diameter. Neither visible by naked eyes nor by microscope.
The particle size of the colloidal solution is between $1 n m t o 1000 n m$ . Not visible by naked eyes but visible by electron or ultramicroscope.
A saturated solution is a type in which no more solute can be dissolved in the solvent.
The homogeneous solution has one phase whereas the heterogeneous solution has more than one phase. It may be a true or colloidal solution.

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