Chemistry (Part-IV)

41. Galena is basically a ________ . [S.S.C. JE Civil Exam 23.03.2021]

(a) Chloride
(b) Fluoride
(c) Sulfide
(d) Hydride

Correct Answer: (c) Sulfide

Solution:Sulfide is the basic chemical nature of galena. Galena is the mineral form of lead(II) sulfide (PbS).

42. The common name of Sulphur is ________ . [S.S.C. Online CHSL (T-I) 23.01.2017]

(a) Freon
(b) Galena
(c) Lime
(d) Brimstone

Correct Answer: (d) Brimstone

Solution:Brimstone is a common, older name for sulfur. It is used in making gunpowder.

43. Which of the metals listed in the options is the least reactive? [S.S.C. Online MTS (T-I) 20.10.2021]

(a) Copper
(b) Iron
(c) Gold
(d) Magnesium

Correct Answer: (c) Gold

Solution:Gold is the least reactive metal among the options listed. The reactivity series shows that gold is much lower in reactivity than copper, iron, and magnesium.

44. Which of the following metals reacts with the moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat? [S.S.C. Online C.H.S.L. (T-I) 16.04.2021]

(a) Copper
(b) Zinc
(c) Iron
(d) Silver

Correct Answer: (a) Copper

Solution:Copper is the metal that reacts with moist carbon dioxide in the air to form a green coating of copper carbonate (CuCO₃), losing its shiny brown surface in the process. This green coating is often called verdigris.

45. Which is base metal of amalgam alloy? [S.S.C. Online MTS (T-I) 17.09.2017]

(a) C
(b) Au
(c) Ag
(d) Hg

Correct Answer: (d) Hg

Solution:Hg (Mercury) is the base metal in an amalgam alloy. An amalgam is an alloy of mercury with another metal.

46. A metal that is a poor conductor of heat is: [S.S.C. Online MTS (T-I) 5.10.2017]

(a) Lead
(b) Gold
(c) Zinc
(d) Iron

Correct Answer: (a) Lead

Solution:Lead is a metal that is a poor conductor of heat compared to gold, zinc, and iron. While all metals conduct heat to some extent, lead's thermal conductivity is significantly lower.

47. A metal, which exists in liquid state _______ . [S.S.C. Online MTS (T-I) 5.10.2017]

(a) Tin
(b) Potassium
(c) Mercury
(d) Tungsten

Correct Answer: (c) Mercury

Solution:Mercury metal (Hg) or mercury is found in the liquid state at room temperature.

48. Which of the following ingredients is present in Antiperspirant Deodorant? [S.S.C. Online MTS (T-I) 6.08.2019]

(a) Aluminium
(b) Iron
(c) Copper
(d) Sodium

Correct Answer: (a) Aluminium

Solution:Aluminium is a common ingredient present in antiperspirant deodorants. Aluminum compounds help to block sweat ducts.

49. Which of the following metals is the most reactive metal? [S.S.C. Online Graduate Level (T-I) 6.06.2019]

(a) Calcium
(b) Copper
(c) Zinc
(d) Iron

Correct Answer: (a) Calcium

Solution:Calcium is the most reactive metal among the options provided. Based on the reactivity series, calcium is more reactive than iron, zinc, and copper.