Miscellaneous And Useful Chemical Compounds (Part-II)

📆 November 1, 2024

Total Questions: 50

21. Burning of coal is an example of [S.S.C. Online CGL (T-I) 01.12.2022 (Shift-I)]

(a) decomposition reaction
(b) double displacement reaction
(c) combination reaction
(d) displacement reaction

Correct Answer: (c) combination reaction

Solution:The combustion of coal is an example of a combination reaction. A combination reaction is a reaction where two or more elements or compounds combine to form a single compound.

22. Unsaturated carbon compounds burn with a: [S.S.C. Online MTS (T-I) 12.10.2021 (Shift-I)]

(a) white sooty flame
(b) orange sooty flame
(c) Red sooty flame
(d) yellow sooty flame

Correct Answer: (d) yellow sooty flame

Solution:Unsaturated organic compounds burn with a yellow flame and a lot of black smoke because they do not burn completely. A large amount of unburned carbon is released along with the smoke, producing yellow-black smoke.

23. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 17.01.2017 (Shift-I)]

(a) Platinum
(b) Carbon
(c) Cobalt
(d) Krypton

Correct Answer: (d) Krypton

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
1772	Platinum	Pt
3500	Carbon	C
1495	Cobalt	Co
-157	Krypton	Kr

24. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 23.01.2017 (Shift-II)]

(a) Titanium
(b) Tungsten
(c) Argon
(d) Nickel

Correct Answer: (c) Argon

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
1660	Titanium	Ti
3410	Tungsten	W
-189	Argon	Ar
1453	Nickel	Ni

25. Which of the following has the lowest melting point? [S.S.C. Online C.P.O.S.I. (T-I) 5.07.2017 (Shift-II)]

(a) Carbon
(b) Silver
(c) Mercury
(d) Gold

Correct Answer: (c) Mercury

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
3500	Carbon	C
962	Silver	Ag
-39	Mercury	Hg
1064	Gold	Au

26. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 30.01.2017 (Shift-I)]

(a) Iron
(b) Nitrogen
(c) Iodine
(d) Lead

Correct Answer: (b) Nitrogen

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
1535	Iron	Fe
-210	Nitrogen	N
114	Iodine	I
327	Lead	Pb

27. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 1.02.2017 (Shift-II)]

(a) Chromium
(b) Hydrogen
(c) Zinc
(d) Silver

Correct Answer: (b) Hydrogen

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
1857	Chromium	Cr
-259	Hydrogen	H
420	Zinc	Zn
962	Silver	Ag

28. Which of the following has the lowest melting point? [S.S.C. Online Graduate Level (T-I) 6.03.2020 (Shift-III)]

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

Correct Answer: (c) Tin

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
327	Lead	Pb
420	Zinc	Zn
232	Tin	Sn
962	Silver	Ag

29. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 27.01.2017 (Shift-II)]

(a) Platinum
(b) Sodium
(c) Antimony
(d) Krypton

Correct Answer: (d) Krypton

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
1772	Platinum	Pt
98	Sodium	Na
630	Antimony	Sb
-157	Krypton	Kr

30. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 20.01.2017 (Shift-II)]

(a) Iodine
(b) Lead
(c) Tin
(d) Mercury

Correct Answer: (d) Mercury

Solution:The melting point is the temperature at which it melts from its solid state to a liquid state. Following are the melting points of given elements:

Melting-point	Name	Chemical
114	Iodine	I
327	Lead	Pb
232	Tin	Sn
-39	Mercury	Hg

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