SECTION A
1. Name two metals which will displace hydrogen from dilute acids.
2. Name one methods for preventing an iron frying pan from rusting.
4. In the electrolytic refining of a metal M, what would you take as the anode and
the cathode?
5. An atom has electronic configuration 2,8,7.What is the atomic number of this
element?
6. What is the common name of the compound CaCl2?
Answers
Answer:
1. iron and aluminum
2. Galvanization.The process for coating metal like iron or steel with a thin zinc layer is known as galvanization.
4. A rod of impure metal M would be used as an anode and a thin strip of pure metal M would be used as the cathode. A water-soluble salt of metal M would be used as an electrolyte.
5. 17
6. calcium chloride
Answer:
2)painting
5) chlorine with atomic munber 17.
6) calcium chloride.
1) iron and aluminium will displace hydrogen as they are more reactive than hydrogen. and the metals like mercury and copper doesn't displace hydrogen as they are less reactive than hydrogen.
4)A rod of impure metal M would be used as an anode and a thin strip of pure metal M would be used as the cathode. A water-soluble salt of metal M would be used as an electrolyte