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Q.

Which pair of the solutions have pH value less than 7?


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a

Solution of copper sulphate and washing soda

b

Solution of soap and washing soda

c

Solution of copper sulphate and vinegar 

d

Solution of washing soda and vinegar

answer is D.

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Detailed Solution

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The copper sulphate and vinegar pair of the solutions have pH value less than 7.
The pH of the solution is defined as the quantitative measure of acidity and basicity of the aqueous or liquid solutions. The pH range occurs from the range between 0 to 14. The copper sulphate and vinegar solution contain acidic radicals SO4- and CH3COO-. Therefore, this solution will produce acids.
 
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