Question : What chemical is added to washing powders to keep them dry ?
(1) Sodium perborate
(2) Sodium carbonate
(3) Sodium sulphate
(4) None of these
Answer : in all above options the correct answer is “(3) Sodium sulphate ” , it means the Sodium sulphate (Na2SO4) is the substance which can be used as as detergent filler it means it is used in washing powders to keep them dry or to protect washing powders from moisture , because if the washing powders absorbing moisture than it can be bad for it. that is why Sodium sulphate (Na2SO4) is mixed in detergent .
Explanation of answer : Sodium perborate is used as de-stain substance in washing powder , it means it used to clean the cloths or we can say it is able to remove marks or sports from the cloths and bring whiteness on cloths , in shorts it used as whitening agents in washing powder.
Sodium carbonate is also cleaning agent especially in hard water. so this is also not used to keep them dry , but Sodium sulphate chemical is added to washing powders to keep them dry that is why we have marked this option correct answer. it meaning is that Sodium sulphate (Na2SO4) acts like silica gel and hence keeps washing powders free from moisture.
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