Question

EXERCISES
A. Choose the most appropriate answer
1. Which of the following is true for all metals?
a. They are hard solids,
b. They have high meting and boilin
c. They have 1-3 valence electrons. d. They are malleable and ductile
2. Gold normally occurs in nature
a in free state. b. as carbonate ore, c. as sulphate ore
das sulphide
3. Which of these is the most reactive metal?
a, magnesium b. gold
c. platinum
d. sodium
4. Which of these metals cannot displace hydrogen from a dilute acid?
b. zinc
a. iron
7. The
d. calcium
c. silver
5. Which one of the following alloys is light and strong?
a. brass
b. stainless steel c. duralium
d. bronze
6. Which of these metals can displace all the other three metals from their salt solutions?
a. copper
b. iron
c. silver
d. zinc
7. Metal A dipped in a salt of metal B displaces B from the solution. This shows that
a. A is more reactive than B.
b. B is more reactive than A
Z
c. both A and B are equally reactive d. no such conclusion can be drawn
8. Metals react with oxygen to form
a. acidic oxides
b. basic oxides
c. either acidic or basic oxide depending d. there is no reaction
on the metal.
9. The metal most used in the construction industry is
a. iron.
b. copper.
c. aluminium
d. in.
3
62 . MATERIALS​

Answer 1

Answer:

1. d they are malleable and ductile

2.a in free state

3. d sodium is the most reactive metal

4.c silver

as it is less reactive than hydrogen,    cannot displace H  from acids

5.bstainless steel

6. iron

7. a. A is more reactive than B

8. c

9.b.copper -- used for cladding, electric wiring ,heating systems, oil and gas lines, rain water systems and roofing

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Answer 2

Answer:

1) they have 1-3 valence electrons or they are malleable and ductile (not sure)

2) in free state

3) sodium

4) silver

5) stainless steel or duralium (not sure)

6) zinc

7) A is more reactive than B

8) basic oxides

9) aluminium

10) none of them