Question

A substance make the cake soll
and spongy
?
By observe the information given in the table and answer the questions given below the table
Colour change
Colour change
Substance
with Red Litmus
(in aqueous solution) with Blue Litmus
Red
No change
А
Blue
B
No change
С
No change
No change
i) Which one of them may be the neutral salt among A, B, C ?
ii) What may happen when some drops of phenolphthalein is added to the substance B?
Why does tooth decay start when pH of the mouth is lower than 5.5 ?​

Answer 1

Answer:

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