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Question

Which of the following is NOT an example of homogenoud mixture ?

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

Oil in water

The correct answer is Option 4 i.e. Oil in water

A homogeneous mixture is one in which the composition is uniform throughout, and the different components cannot be seen separately. Examples include:

  • Salt dissolved in water – forms a clear, uniform solution.

  • Sugar dissolved in water – also completely dissolves and looks the same throughout.

  • Copper sulphate powder in water – when fully dissolved, forms a blue-colored uniform solution.

However, oil in water is a heterogeneous mixture. The two substances do not mix uniformly and form separate layers because oil is immiscible in water. You can see oil droplets or a layer floating on the surface, which means the mixture is not uniform.

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Important Questions from Acids, Bases & Salts

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