Science prep.3 for 2nd term U1 L1 Chemical reactions part1

Choose:
3. The most active metal of the following according to the chemical activity series is ...............

Choose:
?Which of the following substances doesn't produce black product by thermal decomposition

Choose:
………… metal doesn't replace the hydrogen of the diluted acids.

Choose:
Active metals replace the hydrogen of the water and ………… is produced.

Put true or false:
Red mercuric oxide decomposes by heat into silver color precipitate in the tube.