Chemistry
Gelatin is mostly used in making ice–creams in order to

Enrich the aroma
Stabilise the colloid and prevent crystallisation
Prevent making a colloid
Stabilise mixture

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Chemistry
The lustre of the metals is because of

Absorption of light due to the presence of cavities
High polish
High density, due to closed packing of atoms
Reflection of light due to the presence of free electrons

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