Aqueous solution of borax above 62°C gives crystals of

Explanation

Na2B4O7.5H2O: This hydrate has moderate solubility and could potentially crystallize at 62°C, depending on the concentration of the solution.Therefore, based on the relative solubilities of these hydrates, Na2B4O7.5H2O (option b) is the most likely candidate to form crystals in an aqueous solution of borax above 62°C. The higher water content hydrates and the anhydrous form would likely remain dissolved under these conditions.It's important to note that factors like solution concentration and cooling rate can also influence crystal formation. However, considering the general solubilities of the different borax hydrates, option (b) remains the most probable answer.