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CHEMISTRY

Chemistry
Sour taste of lemon is due to the presence of which of the following ?

Oxalic acid
Formic acid
Citric acid
Acetic acid

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Chemistry
PH scale ranges from

0 – 14
0 – 7
8 – 14
None

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Chemistry
Normal rainwater has a pH level of

6.3
8.3
3.2
5.6

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Chemistry
Which one of the following is used as preservative for foodstuff ?

Sodium Chloride
Glycerine
Sodium Benzoate
Picric acid

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Chemistry
The acid which fails to liberate carbon dioxide from sodium bicarbonate is :

Carbonic acid
Formic acid
Acetic acid
Sulphuric acid

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