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As Lemon Juice is an Acid, the colour of the Red Litmus Paper will stay the same.
blue
Red
As orange juice being an acidic solution, it turns blue litmus into red.
Try it out and see what happens
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.
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.
Lemon juice is an acid therefore, it turns blue litmus paper red and red litmus paper remains red
Blue litmus paper would turn red in orange juice.
it turns blue litmus paper red
Mauve Colour
Lemon juice is an acid and blue litmus paper turns red when dipped in an acidic liquid.