Metal And Its Compounds - Study Mode

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[#206] The metal, which is kept in the air for some time, is coated with a layer of green basic carbonate, which is:

(A) nickel

(B) zinc

(C) silver

(D) copper

Correct Answer

(D) copper

[#207] . . . . . . . . metal does not decay.

(A) magnesium

(B) iron

(C) calcium

(D) platinum

Correct Answer

(D) platinum

[#208] The process of adding a thin layer of zinc to iron or steel is called:

(A) anodizing

(B) electroplating

(C) galvanization

(D) alloying

Correct Answer

(C) galvanization

[#209] During lime spraying, Ca (OH) 2 reacts slowly with CO 2 in the air so that the walls to form a thin layer of

(A) CaCO 3

(B) CaSO 4

(C) CaO

(D) CaCl 2

Correct Answer

(A) CaCO 3

[#210] Which one of the following oxides dissolves in water?

(A) CuO

(B) Al 2 O 3

(C) Fe 2 O 3

(D) Na 2 O

Correct Answer

(D) Na 2 O