4HBr(aq) + O2(g)= 2H2O(l) + 2Br2(l)
If is an endothermic reaction.. heat is absorbed from the surrounding.. so it is Positive(+ve).. l hope it helped???
Answer:
this is a coordination compound perhaps tertramminecopper
Answer: The correct option is A.
Explanation: In a chemical reaction, reactants react to form a number of products.
For the formation of products, the bonds of the individual reactants must be broken and the bonds of the products must be formed.
For example: Formation of water from hydrogen gas and oxygen gas. Reaction follows:

The Bonds of hydrogen and oxygen molecule are broken and new bonds between hydrogen and oxygen atoms are formed to give water molecule.