………are called organic acids.
a) HCOOH
b) CH3COOH
c) Both a & b
d) None of these
……… is the process to cut the unprotected part of the metal or glass surface to create a design.
a) Etching
b) Cutting
c) Adhesion
d) Elimination
In etching process………is used.
a) Weak acid
b) strong acid
c) Strong base
d) weak base
Those substances which can act both an acid and a base are called………
a) amphoteric
b) solubility
c) both a & b
d) none of these
………is amphoteric substance.
a) H2O
b) Cl-
c) OH-
d) H+
When water is treated with an acid it acts as a base but when it is reacted with a base, it acts as an acid………
a) H2O
b) H3O+
c) OH-
d) HCl
