Chrome iron ore (x) was heated with dry `Na_(2)CO_(3)` in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. `H_(2)SO_(4)` turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, `NH_(4)Cl` was added. On fractional crystallization, orange red crystals (C ) is formed.
Quick lime is added during heating because

Options

A. To make the mass acidic
B. To make the mass porous
C. To make the mass hard
D. To make the mass wet

Answer

B

Explanation

Addition of lime make the mass porous.