Fill in the blanks in the following sentences :
(a) Acids have a…………….. taste and they turn…………… litmus to……………….
(b) Substances do not show their acidic properties without……………….
(c) Acids produce…………… ions on dissolving in water.
(d) Those substances whose smell (or odour) changes in acidic or basic solutions are called
(e) Onion and vanilla extract are…………..
