i.e CF2Cl2 as cholorflurocarbons were generally used as a refrigerant but as these gases lead to the depletion of ozone layer and have environmental issues therefore new refrigerants are developed and used now a days.
In an exothermic reaction, the reactants:
a.have less energy than the products formed.
b.have more energy than the products formed.
c.are at lower temperature than products.
d.energy is released during reaction.
So, the products formed will comparatively have less energy than reactants. - Therefore, in an exothermic reaction, the reactants have more energy than the products formed. - Therefore, the answer is option (B). Note: Remember exothermic reactions are bond-making processes and therefore, energy is released.
Among Vanadium, Chromium, Manganese and Zinc, Zinc is most volatile.
Group 12 elements are volatile in nature.
All other transition series elements have incomplete d or s or both orbitals thus they can form covalent as well as an ionic bond. While in Zn, d and s orbitals are completely filled so they can form only metallic bonds. And since the metallic bond is weak it makes Zn volatile.