Metal And Its Compounds - Study Mode

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[#216] Molecular formula of potassium nitrate is . . . . . . . .

(A) KNO 3

(B) KNO 2

(C) KNO 4

(D) KNO

Correct Answer

(A) KNO 3

[#217] The lime Ca (OH) 2 reacts slowly with . . . . . . . . in air to form a thin layer of CaCO 3 on the walls.

(A) O 2

(B) CO

(C) CO 2

(D) SO 2

Correct Answer

(C) CO 2

[#218] The chemical formula of ferrous sulphate crystals is . . . . . . . .?

(A) FeSO 4 .4H 2 O

(B) FeSO 4 .6H 2 O

(C) FeSO 4 .7H 2 O

(D) FeSO 4 .5H 2 O

Correct Answer

(C) FeSO 4 .7H 2 O

[#219] What is the common name for sodium carbonate?

(A) Eating Soda

(B) Washing soda

(C) Bleaching powder

(D) Ordinary salt

Correct Answer

(B) Washing soda

[#220] Which of the following metals is most ductile in nature?

(A) Copper

(B) Silver

(C) Gold

(D) Aluminium

Correct Answer

(C) Gold