Which statement is true about the physical state and sources of fats and oils?

A. Oils are liquid and from plants; fats are solid and from animals

B. Oils are solid and from plants; fats are liquid and from animals

C. Both fats and oils are liquid and derived from plants

D. Both fats and oils are solid and derived from animals

What is the main reason soap and detergents are effective in removing dirt from clothes?

D. Lowering of interfacial tension

Everyday Science · Everyday & Industrial Chemistry · page 21 of 21

Includes 23 past paper MCQs (marked).

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201.
The photographic film on which image is to be produced is made up of ?
Correct Answer: D. Silver Halide
One-liner
Photographic film is made up of Silver Halide, which is light-sensitive and forms the image upon exposure.
202.
Rock candy is an example of which one of the following types of solution?
Correct Answer: C. Supersaturated solution
One-liner
Rock candy is an example of a supersaturated solution, which contains more dissolved solute than a saturated solution at a given temperature.
203.
Which statement is true about the physical state and sources of fats and oils?
Correct Answer: A. Oils are liquid and from plants; fats are solid and from animals
One-liner
Oils are liquid at room temperature and typically derived from plants, while fats are solid at room temperature and typically derived from animals.
204.
What is the main reason soap and detergents are effective in removing dirt from clothes?
Correct Answer: D. Lowering of interfacial tension
One-liner
Soap and detergents remove dirt primarily by lowering of interfacial tension between water and oily/greasy dirt, allowing water to wet and lift away the soil.
205.
Potash alum is used as _?
Correct Answer: D. All of these
One-liner
Potash alum is used as a mordant in dyeing, a water purifier, and an antiseptic in medicines — All of these.