Which of the following substances is NOT commonly used as a gelling agent?
Agar
Gelatin
Sodium chloride
Xanthan gum
Sodium chloride (table salt) is not a gelling agent; it is a common salt used for seasoning and preserving food.
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5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K

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