Question

6. A metal that will displace copper from copper sulphate solution is
a. mercury b. gold
c. aluminium d. silver
7. Which of following gases is produced in the reaction of a metal with an acid?
a. Sulphur dioxide b. Carbon dioxide C. Oxygen d. Hydrogen
8 Which of following is the least reactive metal?
b. Potassium C. Copper
d. Silver
9. Which of following metals is used in paints and pigments?
a. Iron
b. Lead
C. Mercury d. Copper
10. Which of following non-metals is used for making matchsticks and fireworks?
a. Sodium
b. Silicon
C. Phosphorous d. Graphite
a. Gold
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Answer 1

Answer:

6. Iron is displace copper from copper sulphate.

7. Hydrogen gas.

8. I think, silver.

9.copper is used in paints.

10. Phosphorus is used in making match sticks.

Explanation:

Hope, it helps you.

Answer 2

6) A metal that will displace copper from copper sulphate solution is

• Aluminium (Option c)

• Note: Aluminium can displace copper from copper sulphate solution because it is more reactive than copper.

7. Which of the following gases is produced in the reaction of a metal with an acid?

• Hydrogen (Option d)

• Note: Hydrogen gases are produced in the reaction of a metal with an acid along with the formation of salt.
• Acid + metal = salt + hydrogen gas

8 Which of following is the least reactive metal?

• Gold (Option a)

• Note: Potassium, Copper and Silver are placed at top of the Gold in the chemistry reactivity series.

9. Which of following metals is used in paints and pigments?

• Lead (Option b)

• Note: Lead is added to paint and pigments as it helps paint to dry faster, increase strength and maintain a fresh colour.

10. Which of following non-metals is used for making matchsticks and fireworks?

• Phosphorus (Option c)

• Note: The tips of matchsticks contain potassium chlorate and red phosphorus on the matchbox striking surface.

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