When milk becomes sour, ___ is produced.
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Which of the following is NOT a noble gas?
Which of the following is used for disinfecting drinking water?
An alloy is an example of
Non-metallic character increases from ____.
One of the techniques used for desalination of sea water is
In the process of ___, the iron is protected by a coating of zinc.
Which of the following metals does NOT react with cold or hot water?
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