If they are stored in metal containers made up of iron or copper, the acids can react with the metal and some health hazardous compounds might get formed.
curd contain lactic and pickle contain acetic acid when acids come contact with acids they release hydrogen gas that is why curd and pickles are not stored in metalic utensils
Q8. A real and enlarge image can be obtained by using a: (a) Convex mirror (b) Plane mirror (c) Concave Mirror (d) Either convex or plane mirror Q9. The correct statement is: (a) Sound and light both require medium for propagation. (b) Sound can travel in vacuum but light cannot. (c) Sound needs medium but light does not need medium for propagation (d) Sound and light both can travel in Vacuum. Q10. Sound in air propagates in the form of: (a) Longitudinal wave (b) Transverse wave (c) Both Longitudinal and transverse wave (d) Neither Longitudinal not Transverse wave