Identify the pair that contains one soluble and one insoluble substance. Explain.
A. Soap and pepper
B. Salt and lemon juice
C. Sugar and salt
D. Chalk powder and sand
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Solution
A. Soap and pepper : Soap is soluble whereas pepper is insoluble.
B. Salt and lemon juice : Both are soluble.
C. Sugar and salt: Both are soluble.
D. Chalk powder and sand: Both are insoluble.
So, option A is the correct answer.