When do chemical reactions produce heat energy?​
(A) Energy required by reactants is more than the energy used in the formation of products.
(B) Energy required by reactants is less than the energy used in the formation of products.
(C) Energy required by reactants is equal to the energy used in the formation of all products.
(D) All of the above.

The correct option is (B). When the energy used by reactant is less than the energy used in formation of product then the excess energy is released in the form of heat. If energy used by reactant is more than the energy used in product then it means that reactant require energy to form product. So, energy is required not released. When the energy of reactant is equal to product it means the energy of reactant is enough to convert into product not more and not less. So neither energy is require nor produced in the reaction.

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