Yes, it is true.
Acid will turn litmus paper red.
Depends on the litmus paper. Red litmus will not turn but blue litmus will turn redish pink.
I believe, that acid makes blue litmus paper turn red.
HCl (hydrochloric acid) is an acid so it will turn litmus paper red. and alkali will go from red litmus to blue.
Acid: Red litmus
TRUE!!!! Litmus will turn BLUE in alkali. However, Litmus paper is a rather unsophisicated methof testing for acids/alkalis. Universal Indicatort will give a range of colours Red, orange, yellow, green , blue, purple indigo. for strong acid (red) through neutral (green) , to strong alkali (Indigo). It is more sensative to acid /alkali strength.
Acids turn blue litmus to red. Bases turn red litmus blue.
Acid can't turn red litmus paperbur base canturn it blue .
Red litmus paper remains red when dipped into an acid. Blue litmus paper will turn red in an acid. Similarly, Blue litmus remains blue in a base. Red litmus turns blue in a base.
Hydrochloric acid will keep litmus red - it needs alkali to turn it blue
When an acid touches Litmus paper it turns red (pink).
Acid turns it in red, while base will turn it blue.