Assertion : In diffusion, molecules move in a random fashion.

Reason : Diffusion can be both uphill and downhill.

if both A and R are true and R is the correct explanation of A

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if both A and R are true but R is not the correct explanation of A

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if A is true but R is false

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if both A and R are false.

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Solution

The correct option is C
if A is true but R is false

Diffusion cannot be uphill , it will naturally be along and not against.

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Assertion : In diffusion, molecules move in a random fashion. Reason : Diffusion can be both uphill and downhill.

The correct option is C if A is true but R is false Diffusion cannot be uphill , it will naturally be along and not against.

Assertion : In diffusion, molecules move in a random fashion.

Reason : Diffusion can be both uphill and downhill.

The correct option is C
if A is true but R is false

Diffusion cannot be uphill , it will naturally be along and not against.