Answer:
Ni
Explanation:
An active metal is a highly reactive metal. Active metals are found high up in the activity series.
Active metals react with other metals that are lower than them in the activity thereby displacing the lower metals from a solution of their salts. This is what may have happened in the other two reactions.
Ni is the most active metal listed in the question since it can react a compounds with Pb(NO3)2(aq) to liberate Pb metal.
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Answer: 60 g/ mole SiO2
Explanation: The mass of Si silicon is 28 and the mass of O oxygen is 16. There are 2 oxygen atoms so we will multiply the mass of oxygen by 2.
Si = 28
O = 16 x 2
= 60 g / mole SiO2