An indicator mixed with agar forms a pink colour. The pink-coloured agar becomes colourless when put in acid.
Blocks of pink-coloured agar are cut to different sizes and put in acid. All other variables are kept constant.
Which block becomes colourless most quickly?
$3mm \times 30mm \times 30mm$
2 )
$6mm \times 6mm \times 6mm$
3 )
$6mm \times 12mm \times 12mm$
4 )
$12mm \times 12mm \times 12mm$
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