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Nano crystalline materials synthesised by sol-gel technique results in a foam like structures called ___________

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Nano crystalline materials synthesised by sol-gel technique results in a foam like structures called ___________

(a) Gel

(b) Aerosol

(c) Foam

(d) Aerogel
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The correct option is (d) Aerogel

Easy explanation: The foam-like material formed is called aerogel. They are porous and extremely lightweight, yet they can load equivalent to 100 times their weight. They are used as insulation materials.
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