Question

which of these is a property of acids? they feel slippery. they turn litmus paper blue. they produce hydrogen gas when reacted with metals. they taste bitter.

Explanation:

• Acids do not feel slippery (that's a property of bases).
• Acids turn blue litmus paper red, not blue.
• Acids taste sour, not bitter (bitter is a base property).
• When acids react with metals (e.g., \(Zn + 2HCl=ZnCl_2 + H_2\uparrow\)), hydrogen gas is produced.

Answer:

They produce hydrogen gas when reacted with metals.