Chemistry (Part-IV)

21. Which one of the following is an ore mineral of copper? [S.S.C. Online Constable GD 3.03.2019]

(a) Chalcocite
(b) Cinnabar
(c) Galena
(d) Cassiterite

Correct Answer: (a) Chalcocite

Solution:Chalcocite is an important ore mineral of copper. It is a copper sulfide mineral with the chemical formula Cu₂S. Cinnabar is an ore of mercury, galena is an ore of lead, and cassiterite is an ore of tin.

22. Pyrolusite is an ore/mineral of- [S.S.C. Online CHSL (T-I) 30.01.2017]

(a) Mercury
(b) Manganese
(c) Molybdenum
(d) Lead

Correct Answer: (b) Manganese

Solution:Manganese is the metal for which pyrolusite is a significant ore/mineral. Pyrolusite is mainly composed of manganese dioxide (MnO₂).

23. Manganite is an ore/mineral of _______ . [S.S.C. Online CHSL (T-I) 15.01.2017]

(a) Beryllium
(b) Chromisim
(c) Manganese
(d) Copper

Correct Answer: (c) Manganese

Solution: Manganese is also the metal for which manganite is an ore/mineral. Manganite is a manganese oxide hydroxide mineral with the formula MnO(OH).

24. Beryl is an ore/mineral of _______. [S.S.C. Online CHSL (T-I) 19.01.2017]

(a) Nickel
(b) Beryllium
(c) Lead
(d) Tin

Correct Answer: (b) Beryllium

Solution:Beryllium is obtained from the ore/mineral beryl. Beryl is a beryllium aluminum cyclosilicate mineral with the chemical formula Be₃Al₂(SiO₃)₆.

25. Bauxite is an ore/mineral of _______. [S.S.C. Online CHSL (T-I) 11.01.2017]

(a) Aluminium
(b) Beryllium
(c) Lead
(d) Tin

Correct Answer: (a) Aluminium

Solution:Bauxite (Al₂O₃.2H₂O) is an ore of Aluminium. Aluminium is extracted from bauxite. Bauxite is not a specific mineral but rather a rock composed mainly of aluminum hydroxides.

26. Which of the following minerals has kieserite as its ore? [S.S.C. Online MTS (T-I) 12.10.2021]

(a) Magnesium
(b) Potassium
(c) Iron
(d) Silver

Correct Answer: (a) Magnesium

Solution:Magnesium is the metal that has kieserite as one of its ore minerals. Kieserite is a magnesium sulfate mineral with the chemical formula MgSO₄·H₂O.

27. Dolomite is an ore of _______ . [S.S.C. Online MTS (T-I) 20.10.2021]

(a) magnesium
(b) potassium
(d) sodium
(c) aluminium

Correct Answer: (a) magnesium

Solution:Magnesium is one of the metals that can be extracted from dolomite. Dolomite is a calcium magnesium carbonate mineral with the formula CaMg(CO₃)₂.

28. Pentlandite is an ore/mineral of _______. [S.S.C. Online CHSI (F-I) 31.01.2017]

(a) Titanium
(b) Nickel
(c) Uranium
(d) Zinc

Correct Answer: (b) Nickel

Solution:Pentlandite is an important ore of nickel. It is used for electroplating. Canada, Australia, and the USA are the major producing countries.

29. Turquoise is an ore/mineral of _______. [S.S.C. Online CHSL (T-I) 10.01.2017]

(a) Copper
(b) Manganese
(c) Mercury
(d) Tin

Correct Answer: (a) Copper

Solution: Copper is the metal for which turquoise is considered an ore/mineral, although primarily valued as a gemstone. Turquoise is a hydrated copper aluminum phosphate mineral with the formula CuAl₆(PO₄)₄(OH)₈·4H₂O.
Some other ores of copper are chalcopyrite, cuprite, azurite and malachite, etc.

30. The concentration of salts (measured as salinity per thousand parts) in hypersaline lagoons exceeds %. [S.S.C. Online Graduate Level (T-I) 22.08.2017]

(a) 50
(b) 100
(c) 150
(d) 200

Correct Answer: (b) 100

Solution:100 is the percentage that the concentration of salts (measured as salinity per thousand parts) in hypersaline lagoons exceeds. Hypersaline lagoons are bodies of water with salinity levels significantly higher than that of the open ocean (which is typically around 35 parts per thousand).