Question

Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with hydrochloric acid? *

1 point

magnesium

aluminium

iron

copper

Which of the following reacts with cold water vigorously? *
1 point
carbon
sodium
magnesium
sulphur​

Answer 1

Answer:

1. According to the reactivity series of metals Magnesium iron and aluminium cones above hydrogen that means they are more reactive than hydrogen but copper comes under hydrogen i.e. it is less reactive than hydrogen hence, copper is not able to replace hydrogen from dilute hydrochloric acid.
2. Sodium is a light and soft metal that reacts vigorously with cold water. Sodium when dropped in cold water forms a ball and moves on the surface of cold water with sodium hydroxide formation accompanied with the release of hydrogen gas.
3. 2Na+2H
4. 2
6. O→2NaOH+H
7. 2