HCl
H2SO4
HNO3
H3PO4
red
purple
blue
colourless
pale pink
pink
red
orange
yellow
salt+water
salt+water
salt+water+co2
salt+hydrogen
passes through limewater makes it milky
put metal and acid in test tube and if popping noise made when burning splint is held at end of test tube hydrogen is present
base
alkali