Question

Iron powder and powder of rust are taken in two containers X and Y respectively. Dilute sulphuric acid is added to both the containers. Then
A. effervescence is observed in two containers.
B. effervescence is observed in case of X but not Y.
C. effervescence is observed in case of Y but not X.
D. no effervescence is observed in both cases.

Answer 1

Correct Answer - B
Iron is an element and rust is a compound of iron in which iron does not retain its properties and hence rust does not liberate hydrogen gas with dilute sulphuric acid and no effervescence is observed in container Y.