Alloys

11. Which one of the following metals does not form amalgam? [I.A.S. (Pre) 1999]

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

Correct Answer: (d) Iron

Solution:An amalgam is a substance formed by the reaction of Mercury with another metal. Almost all metals can form amalgams with Mercury, the notable exception being Iron.

12. Which one of the following alloys is called an amalgam? [U.P.P.C.S. (Mains) 2012]

(a) Zinc
(b) Copper
(c) Mercury
(d) Lead

Correct Answer: (c) Mercury

Solution:An amalgam is a substance formed by the reaction of mercury with another metal.

13. Solder used in soldering metal pieces is an alloy of— [U.P.P.C.S. (Pre) 2005, U.P.P.C.S. (Pre) 1996]

(a) Tin and Lead
(b) Tin and Copper
(c) Tin, Zinc, and Copper
(d) Tin, Lead, and Zinc

Correct Answer: (a) Tin and Lead

Solution:The common composition of solder is about 32% Tin and 68% Lead. This combination has a low melting point and is useful for soldering components that are sensitive to heat.

14. Bronze is an alloy of— [U.P.P.C.S. (Pre) (Re. Exam) 2015]

(a) Copper and Tin
(b) Copper and Silver
(c) Copper and Zinc
(d) Copper and Lead

Correct Answer: (a) Copper and Tin

Solution:Bronze is an alloy made up of Copper and another metal Tin. Compositions may vary, but most modern bronze is about 88% Copper and 12% Tin.

15. Bronze is an alloy of copper and— [U.P. P.C.S. (Mains) 2016]

(a) Tin
(b) Aluminium
(c) Silver
(d) Nickel

Correct Answer: (a) Tin

Solution:Bronze is an alloy made up of Copper and another metal Tin. Compositions may vary, but most modern bronze is about 88% Copper and 12% Tin.

16. Match List-I with List-II and select the correct answer using the codes given below the lists: [I.A.S. (Pre) 2000]

List-I	List-II
A. German silver	1. Tin
B. Solder	2. Nickel
C. Bleaching powder	3. Sodium
D. Hypo	4. Chlorine

Code:

Option	A	B	C	D
(a)	1	2	4	3
(b)	2	1	3	4
(c)	1	2	3	4
(d)	2	1	4	3

Correct Answer: (d)

Solution:German Silver or Nickel silver is an alloy consisting of about 50% Copper, 35% Zinc, and 15% Nickel. It doesn't have Silver. Solder of Tin and Lead is known as soft solder. The chemical name of bleaching powder is calcium hypochlorite(

C a (OCl) C or

Ca(ClO)₂. Sodium Thiosulphate (Hypo) is a crystalline white smell-less solid.

17. Percentage of Silver in German Silver is: [U.P.P.C.S. (Mains) 2003]

(c) 0%
(a) 1%
(b) 5%
(d) None of these

Correct Answer: (c) 0%

Solution:German Silver or Nickel silver is an alloy consisting of about 50% Copper, 35% Zinc, and 15% Nickel. It doesn't have Silver.

18. How much percentage of silver is found in German Silver? [Chhattisgarh P.C.S. (Pre) 2020]

(a) 20%
(b) 30%
(c) 60%
(d) None of these

Correct Answer: (d) None of these

Solution:German Silver or Nickel silver is an alloy consisting of about 50% Copper, 35% Zinc, and 15% Nickel. It doesn't have Silver. So option (d) is right answer.

19. Which one of the following elements is not present in the German Silver? [R.A.S./R.T.S. (Pre) 2007]

(a) Copper
(b) Aluminium
(c) Zinc
(d) Nickel

Correct Answer: (b) Aluminium

Solution:German Silver or Nickel silver is an alloy consisting of about 50% Copper, 35% Zinc, and 15% Nickel. Correct Answer: (b) Aluminium

20. Which of the following alloys has a maximum percentage of Copper? [U.P. Lower Sub. (Spl.) (Pre) 2008]

(a) Brass
(b) Bronze
(c) German Silver
(d) Gun Metal

Correct Answer: (b) Bronze

Solution:Brass consists of about 68-71% Copper, and the rest is Zinc. Bronze consists of about 88% Copper and 12% Tin. German silver has almost 50% Copper. Gunmetal consists of about 85% Copper, 5% Tin, 5% Lead, 5% Zinc.