Question

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A bone becomes soft and flexible when placed in dilute

Answer 1

A bone becomes soft and flexible when placed in dilute hydrochloric acid.

Bone is the chief component of our skeleton. It consists of organic and inorganic materials. The inorganic part constitutes nearly two-thirds of the entire bone substance and includes mainly the compounds of calcium and phosphorus. If a bone is placed in weak hydrochloric acid, the mineral part is removed from it (gets dissolved) and the remaining organic framework is left behind. Such a bone is called decalcified (calcium removed) bone and it is soft and flexible.​​