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Chemistry (Part-XI)

📆 May 20, 2025

Total Questions: 50

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

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 
-112XenonXe
114IodineI
725BariumBa
639MagnesiumMg

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

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 
-218Oxygen0
1772PlatinumPt
98SodiumNa
232TinSn

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

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 
420ZincZn
1660TitaniumTi
113SulfurS
-220FluorineF

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

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 
-7BromineBr
420ZincZn
327LeadPb
839CalciumCa

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

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 
98SodiumNa
232TinSn
-71RadonRn
700RadiumRa

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

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 
232TinSn
-259HydrogenH
3500CarbonC
98SodiumNa

7. 'Rn' is the chemical symbol of which element? [S.S.C. Online C.P.O.S.I. (T-I) 5.07.2017 (Shift-II) ]

Correct Answer: (b) Radon
Solution:The 'Rn' symbol is the symbol for the element Radon. It is a colorless, tasteless gas. Radon is included in the category of noble gas, which is the 18th group of the periodic table. Its atomic number is 86 and its atomic weight is 222.

8. What is the name of the second lightest gas among all the gases? [C.P.O. S.I. 5.06.2016 (Shift-I) ]

Correct Answer: (c) Hydrogen
Solution:Of all the gases, the lightest gas is hydrogen and the second lightest gas is helium. Radon is the heaviest gas.

9. Which one has the highest electronegativity among the following elements? [S.S.C. Online CHSL (T-I) 18.01.2017 (Shift-III) ]

Correct Answer: (c) Arsenic
Solution:Arsenic has the highest electronegativity compared to gallium, sodium, and cesium. The electronegativity of arsenic is 2.18, that of cesium and sodium is 0.79 and 0.93 respectively and that of gallium is 1.81.

10. Which one of the following is not an inert gas? [S.S.C. Online Stenographer 14.09.2017 (Shift-I) ]

Correct Answer: (c) Carbon
Solution:Carbon is not included in the group of inert gases. The inert gas is known as the noble gas, which includes the following elements - Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn), etc.
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