Four agar blocks are stained green using universal indicator and suspended in $1mol\,d{m^{ - 3}}$ hydrochloric acid.
The time taken for the agar blocks to change from green to red was recorded.
Which agar block would be the first to become completely red?
1 )
$2cm \times 2cm \times 2cm$
$2cm \times 1cm \times 4cm$
3 )
$2cm \times 3cm \times 2cm$
4 )
$2cm \times 2cm \times 3cm$
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