Answer :

1) When sodium, magnesium and copper are left in air, sodium reacts instantly with oxygen to form sodium oxide as it is a very reactive metal, magnesium reacts with oxygen to form magnesium oxide only on heating, whereas copper does not burn in air even on strong heating. It reacts only when the heating is done for a long time. By this we can say that sodium is most reactive, then magnesium and copper is the least reactive among the given three.

2) When Sodium reacts instantly with cold water it forms sodium hydroxide and hydrogen, magnesium does not react with cold water but it reacts with hot water to form magnesium hydroxide and hydrogen gas but on the other hand copper do not react even with steam. This shows that sodium is highly reactive; magnesium is less reactive than sodium and copper is the least reactive among the three.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

What is observed Science - Board Papers

An element X reacts Lakhmir Singh & Manjit Kaur - Chemistry
Out of aluminium, coLakhmir Singh & Manjit Kaur - Chemistry
The least reactive mLakhmir Singh & Manjit Kaur - Chemistry
An element X forms tLakhmir Singh & Manjit Kaur - Chemistry
The metals which canLakhmir Singh & Manjit Kaur - Chemistry
Out of the followingLakhmir Singh & Manjit Kaur - Chemistry