Acid turns blue litmus paper……….
a) brown
b) orange
c) red
d) yellow
……….are very
corrosive.
a) weak acid
b) weak base
c) strong acid
d) None of these
A base is any metal oxide or hydroxide that reacts with an acid to produce…… and………
a) salt, water
b) salt and oxygen
c) salt , hydrogen
d) salt , water
Water soluble base is called an……….
a) noble gas
b) actinide
c) lanthanide
d) alkali
All……….are bases but all bases are not alkalis.
a)Lanthanide
b) actinide
c) alkalis
d) All of these
……….have bitter taste and feel soapy
a) Acids
b) Bases
c) Salts
d) All of these
Why it change from blue to red
by at 2025-08-09 10:51:32