Miscellaneous And Useful Chemical Compounds (Part-II)

31. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 2.02.2017 (Shift-I)]

(a) Xenon
(b) Iodine
(c) Barium
(d) Magnesium

Correct Answer: (a) Xenon

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
-112	Xenon	Xe
114	Iodine	I
725	Barium	Ba
639	Magnesium	Mg

32. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 31.01.2017 (Shift-I)]

(a) Oxygen
(b) Platinum
(c) Sodium
(d) Tin

Correct Answer: (a) Oxygen

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
-218	Oxygen	O
1772	Platinum	Pt
98	Sodium	Na
232	Tin	Sn

33. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 7.02.2017 (Shift-I)]

(a) Zinc
(b) Titanium
(c) Sulphur
(d) Fluorine

Correct Answer: (d) Fluorine

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
420	Zinc	Zn
1660	Titanium	Ti
113	Sulfur	S
-220	Fluorine	F

34. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 18.01.2017 (Shift-I)]

(a) Bromine
(b) Zinc
(c) Lead
(d) Calcium

Correct Answer: (a) Bromine

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
-7	Bromine	Br
420	Zinc	Zn
327	Lead	Pb
839	Calcium	Ca

35. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 21.01.2017 (Shift-I)]

(a) Sodium
(b) Tin
(c) Radon
(d) Radium

Correct Answer: (c) Radon

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
98	Sodium	Na
232	Tin	Sn
-71	Radon	Rn
700	Radium	Ra

36. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 29.01.2017 (Shift-II)]

(a) Tin
(b) Hydrogen
(c) Carbon
(d) Sodium

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
232	Tin	Sn
-259	Hydrogen	H
3500	Carbon	C
98	Sodium	Na

37. Which of the following is NOT a property of graphite? [S.S.C. Online MTS (T-1) 12.10.2021 (Shift-I)]

(a) It has a lower density than diamond.
(b) It has low melting point
(c) It is a conductor of electricity
(d) It is a conductor of heat

Correct Answer: (b) It has low melting point

Solution:Graphite is an allotrope of carbon (C), which has a melting point of about 3600 °C. Graphite is a good conductor and soft material. The density of graphite is less than that of a diamond.

38. How many natural isotopes of carbon are there? [S.S.C. Online MTS (T-1) 11.10.2021 (Shift-III)]

(a) 3
(b) 5
(c) 2
(d) 4

Correct Answer: (a) 3

Solution:Carbon is found in nature in the form of three isotopes, namely carbon-12, carbon-13, and carbon-14, all of them have 6 protons in their nucleus, but the number of neutrons is different in each, i.e., 6, 7, and 8 respectively.

39. Which of the following is a tough, porous, and black substance, and almost a pure form of carbon? [S.S.C. Online MTS (T-1) 11.07.2022 (Shift-I)]

(a) Coal tar
(b) Bitumen
(c) Coal gas
(d) Coke

Correct Answer: (d) Coke

Solution:The tough, porous, and black substance, and almost pure form of carbon is coke. It is obtained from heating coal in the absence of air, and it is widely used as a fuel and as a reducing agent in industries. Coke is used in the production of iron and steel in blast furnaces, and it is also used as a fuel in power plants and cement kilns. The other options listed are also hydrocarbons derived from coal, but they have different properties and uses.

40. Which of the following is not a good conductor of electricity? [S.S.C. Online C.H.S.L. (T-1) 19.04.2021 (Shift-I)]

(a) Soil
(b) Gold
(c) Graphite
(d) Diamond

Correct Answer: (d) Diamond

Solution:Diamond is not a good conductor of electricity because the carbon atoms in diamond are linked together by covalent bonds. Hence free electrons are not available in diamonds for the conduction of electricity.

Miscellaneous And Useful Chemical Compounds (Part-II)

31. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 2.02.2017 (Shift-I)]

32. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 31.01.2017 (Shift-I)]

33. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 7.02.2017 (Shift-I)]

34. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 18.01.2017 (Shift-I)]

35. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 21.01.2017 (Shift-I)]

36. Which of the following elements has the lowest melting point? [S.S.C. Online CHSL (T-I) 29.01.2017 (Shift-II)]

37. Which of the following is NOT a property of graphite? [S.S.C. Online MTS (T-1) 12.10.2021 (Shift-I)]

38. How many natural isotopes of carbon are there? [S.S.C. Online MTS (T-1) 11.10.2021 (Shift-III)]

39. Which of the following is a tough, porous, and black substance, and almost a pure form of carbon? [S.S.C. Online MTS (T-1) 11.07.2022 (Shift-I)]

40. Which of the following is not a good conductor of electricity? [S.S.C. Online C.H.S.L. (T-1) 19.04.2021 (Shift-I)]

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