Nitrogen from a gaseous phase is to be diffused into pure iron at 700°c. if the surface concentration is maintained at 0.1 wt% n, what will be the concentration 1 mm from the surface after 10 h? the diffusion coefficient for nitrogen in iron at 700°c is 2.5 × 10−11 m2/s.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

fe 55.85 g/mol and h2o 18.02 g/mol.