IL Fill in the blanks
is a chemical that changes its colour to indicate the presence of a chemical substance.
are substances that have a sour taste.
3. Rain containing excess of acid is called
are substances that taste bitter and feel slippery to the skin.
and
are examples of naturally occurring indicators.
6. When an acidic solution is mixed with a basic solution, they
each other forming
and water
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they form salt and water .
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