WHAT IS THE USE OF CAUSTIC SODA

1) Soap and detergent preparation
2) Metal processing
3) Oil refining 
4) Water treatment
 

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pata nahi...???
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I DO NOT KNOW, SEARCH ON NET
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use of caustic soda is used for test the presence of proteins  
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dear akash
you can refer to study material
regards
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What are you looking for?