Common body-centered cubic (bcc) metals do not include
a) chromiumb) titanium
c) aluminumd) tungsten

Titanium

Explanation:

BCC i.e. body-centered cubic is a type of non-primitive unit cell.

In bcc type crystal structure the atoms are arranged in the corners of the unit cell and also on the center of the body of that unit cell.

Among the given options Titanium is the only metal which does not form bcc type crystal structure.

Titanium forms hcp (hexagonal close packing ) type of crystal structure.

The coordination number of hcp is 12 and it is ABAB type lattice.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.