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A piece of bone such as femur of frog if kept in dilute HCl for about a week will:

1. assume black colour
2. shrink in size
3. turn flexible
4. crack into pieces

Correct answer: turn flexible

Solution

Dilute HCl decalcifies the bone by removing calcium salts, especially calcium phosphate. The collagenous organic matrix remains, making the bone soft and flexible instead of hard and rigid.

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