A substance is considered more efficient at storing energy when its specific heat enables it to resist changes in temperature. S
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A chemical substance that gains or accepts electrons from others is called lewis acids. The Lewis acid in the reaction is Trihydridoboron
For the formation of the covalent bonds the molecule or the atoms that accept or gain an electron from the other species present in the reaction are called lewis acids. The species formed after accepting electrons are called a conjugate base.
The species that donates electrons to the other species are called lewis base and the species formed after the electron donation is called a conjugate acid.
Therefore, option B. is the lewis acid as it gains an electron.
Learn more about lewis acids here: