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CBSE Notes 2011-2012

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the...

Multiple choice question

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowishorange. Which of the following would change the colour of this pH paper to greenish-blue ?

unknown

Lemon juice

unknown

Vinegar

unknown

Common salt

unknown

An antacid