Metal react with acid

What is the color change of this metal + acid reaction:

magnesium + hydrochloric acid = magnesium chlodride + hydrogen

• dull grey

• colourless

• blue

• red

Which one is an example of reaction of metal + acid?

• Magnesium + hydrochloric acid = magnesium chloride + hydrogen

• sodium + water = sodium hydroxide + hydrogen

• potassium + oxygen = potassium peroxide + oxygen

• Aluminium + sodium hydroxide = sodium aluminate + hydrogen

All of the following metals react with dilute acids to form salt and hydrogen gas except:

• Fe

• Mg

• Cu

• Zn

Write the equation for this reaction

Write the product of this reaction

why do some metal react with acids and other metals dont?