Question

18. Which of the following is called a noble metal?
(A) Mercury (B) Gold (C) Lithium (D) Caesium
19. Identify the metal which is soft.
(A) Na (B) Pb (C) AI (D) Cu
20. Why is tungsten used as a filament in electric bulbs?
(A) It is sonorous.
(B) It is metallic
(C) It has a high melting point. (D) It has high density
21. Which of the following is NOT a heavy metal?
(A) Cd (B) Hg (C) Pb (D)K
22. Which of the following substances will prevent corrosion
(A) Nitrogen (B) Hydrogen (C) Oxygen
(D) Car​

Answer 1

Answer:

Question 18

Lithium

Question 19

Pb

Question 20

It is sonorous

Question21

Cd

Question 22

Nitrogen

Answer 2

Answer:

Explanation:

18. Gold

19.sodium

20.it has high melting point

21.lead

22.nitrogen