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Chemistry (Part-III)

📆 October 29, 2024

Total Questions: 31

1. Halogens have _________ electrons in their outer-most shells. [S.S.C. Online CGL (T-I) 16.08.2021]

Correct Answer: (b) Seven
Solution:

The six non-metallic elements in Group 17 (or Group VIIA) of the periodic table are called halogens. These six elements are fluorine (F), chlorine (CI), bromine (Br), iodine (Shift-1) and astatine (At). All of them have seven electrons in their outermost shell.

2. The elements of groups 3 to 12 are called __________ elements or transition elements. [S.S.C. Online Graduate Level (T-I) 16.08.2021]

Correct Answer: (b) d-block
Solution:Elements in groups 3 to 12 of the periodic table are called d-block elements or transition clements. The d-orbitals of these elements are incomplete or only partially complete. All transition elements are metals.

3. The elements in the middle of the periodic table are called __________. [S.S.C. Online MTS (T-I) 10.10.2017]

Correct Answer: (b) Transition element
Solution:Elements found in the middle part of the periodic table are called 'transition elements. They are called d-block elements because the electrons added to this block of elements are added to the d-orbital.

4. Elements in a period have same: [S.S.C. Ane MTS (T-I) 12.10.2017]

Correct Answer: (c) Number of shells
Solution:

Elements of the same period also have the same number of atomic orbital

5. Which of the following elements is NOT a Rare Earth Element? [S.S.C. JE Civil Exam 30.10.2020]

Correct Answer: (a) Helium
Solution:

Helium is not a rare earth element, but it is an inert element. It is the second most abundant element in the universe. It is used in diving, weather forecasting etc.

6. Which of the following metals has maximum thermal conductivity? [S.S.C. Online Graduate Level (T-I) 4.09.2016]

Correct Answer: (c) Aluminium
Solution:When a metal is heated, its atoms gain energy and vibrate more vigorously. This energy is transferred to the electrons present in the atoms. These electrons travel to the metal, they transfer energy to other electrons and atoms of the same element. The thermal conductivity is represented by the sign K. Its unit is Watt per meter-Kelvin (W/m-k). The thermal conductivity of silver is 406, that of copper is 385, that of aluminium is 205 and that of iron is 79.5 watts per m-Kelvin.

7. Which of the following is a polar molecule? [S.S.C. Online C.H.S.L. (T-I) 09.08.2021]

Correct Answer: (b) Water
Solution:Water molecules (Hâ‚‚O) are polar in nature. That is. both the hydrogen atoms present in a molecule of water have a positive charge and the central oxygen atom has a negative charge. This is due to oxygen's more negatively electronegative nature, which results in higher electron density near the oxygen atom.

8. In reference to atomicity, argon is: [S.S.C. Online CGL (T-I) 20.08.2021]

Correct Answer: (a) monoatomic
Solution:The number of atoms in the molecule of an element is called atomicity. The atomicity of argon (Ar) is one. That is, argon is an inert gas found in the monoatomic state.

9. Which is the heaviest metal among the following? [S.S.C. Online Graduate Level (T-I) 1.09.2016]

Correct Answer: (a) Gold
Solution:Those elements whose density is more than 5 grams per cubic centimeter are called 'heavy metals". The density of gold is 19.32, the density of silver is 10.5. the density of iron is 7.87 and that of copper is 8.96. Hence, the heaviest metal among the above is gold.

10. Which one of the following elements is a Monatomic unit? [S.S.C. Online CGL (T-I) 17.08.2021]

Correct Answer: (a) Gold
Solution:The symbol for gold is Au. It is a single atomic element. That is, its atoms do not combine with each other to form diatomic, triatomic, or polyatomic molecules.
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