Blocks of agar are stained with a pH indicator and used to investigate the diffusion of an acid solution.
Which block would completely change colour the fastest?
1 )
$$1mm \times 1mm \times 1mm$$
$$1mm \times 0.25mm \times 0.25mm$$
3 )
$$1mm \times 0.5mm \times 0.5mm$$
4 )
$$2mm \times 0.5mm \times 0.5mm$$
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