blue
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it turns acidic or very basic
Lemon juice contains citric acid so blue litmus paper dipped in lemon juice will turn red indicating that it is acidic.
blue
Red
Lemon juice is an acid and blue litmus paper turns red when dipped in an acidic liquid.
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It would remain red, red litmus paper only reacts to blue in the presence of a base. Lemon juice is acidic and thus wouldn't turn the paper a color. If blue litmus paper was used in the lemon juice it would turn red. Consequently dipping blue litmus paper in a base won't change the color because it does not react with bases, only acids.
Litmus paper, phenolphthalein, and red cabbage juice are substances that change color in response to changes in acidity or basicity. Litmus paper turns red in acid and blue in base, phenolphthalein is colorless in acid and pink in base, and red cabbage juice turns red in acid and blue in base.
Litmus is a dye extracted from lichens, a plant. Upon addition of acid, litmus turns red whilst on addition of base, litmus turns blue. Being acidic, containing citric acid, lemon juice is expected to turn violet litmus paper red.
A green-y yellow.
Apple juice is slightly acidic and therefore red litmus will not change color.