A sample of soil is mixed with water and...

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

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

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