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

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Solution of copper sulphate and washing soda

Solution of soap and washing soda

Solution of copper sulphate and vinegar

Solution of washing soda and vinegar

answer is D.

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Detailed Solution

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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