Class 11 Chemistry MCQ Chapter 3 Classification of Elements and Periodicity in Properties Solutions to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Chemistry MCQ Chapter 3 Classification of Elements and Periodicity in Properties Solutions and select need one. Class 11 Chemistry MCQ Chapter 3 Classification of Elements and Periodicity in Properties Question Answers Download PDF. AHSEC Chemistry Multiple Choice Class 11 Solutions.
Class 11 Chemistry MCQ Chapter 3 Classification of Elements and Periodicity in Properties
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. HS 1st Year Chemistry Objective Type Solutions are part of All Subject Solutions. Here we have given NCERT Class 11 Chemistry Multiple Choice Question and Answer, NCERT Class 11 Chemistry Objective Type Solutions for All Chapters, You can practice these here.
Classification of Elements and Periodicity in Properties
Chapter: 3
| MCQ |
1. Consider the isoelectronic species, Na⁺, Mg²⁺, F⁻, and O²⁻ The correct order of increasing length of their radii is:
(i) Mg²⁺ < Na⁺ < F⁻ < O²⁻
(ii) F⁻ < O²⁻ < Mg²⁺ < Na⁺
(iii) O²⁻ < F⁻ < Mg²⁺ < Na⁺
(iv) OO²⁻ < F⁻ < Na⁺ < Mg²
Ans: (i) Mg²⁺ < Na⁺ < F⁻ < O²⁻
2. The element with atomic number 35 belongs to
(i) d – Block.
(ii) f – Block.
(iii) p – Block.
(iv) s – Block.
Ans: (iii) p – Block.
3. Which of the following is not an actinoid?
(i) Curium (Z = 96).
(ii) Californium (Z = 98).
(ii) Uranium (Z = 92).
(iv) Terbium (Z = 65).
Ans. (iv) Terbium (Z = 65).
4. The screening effect of d-electrons is –
(i) Equal to the p-electrons.
(ii) Much more than p-electron.
(iii) Same as f-electrons.
(iv) Less than p-electrons.
Ans: (iv) Less than p-electrons.
5. The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons is:
(i) f > p > s > d.
(ii) f > d > p > s.
(iii) p < d < s > f.
(iv) s > p > d > f.
Ans: (iv) s > p > d > f.
6. According to Moseley’s observations, the more fundamental property of an element is its:
(i) Atomic mass.
(ii) Atomic number.
(iii) X-ray frequency.
(iv) Electronegativity.
Ans: (ii) Atomic number.
7. The first ionisation enthalpies of Na, Mg, Al and Si are in the order:
(i) Na < Mg > Al < Si.
(ii) Na > Mg > Al > Si.
(iii) Na < Mg < Al < Si.
(iv) Na > Mg > Al < Si.
Ans: (i) Na < Mg > Al < Si.
8. The electronic Configuration of gadolinium (Atomic number 64) is:
(i) [Xe] 4f3 5d5 6s2
(ii) [Xe] 4f7 5d1 6s2
(iii) [Xe] 4f7 5d2 6s1
(iv) [Xe] 4f8 5d6 6s2
Ans: (ii) [Xe] 4f7 5d1 6s2
9. The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:
(i) Both are found together in nature.
(ii) Both have nearly the same size.
(iii) Both have similar electronic configuration.
(iv) The ratio of their charge and size (i.e. charge density) is nearly the same.
Ans: (iv) The ratio of their charge and size (i.e. charge density) is nearly the same.
10. The statement that is not correct for periodic classification of elements is:
(i) The properties of elements are periodic functions of their atomic numbers.
(ii) Non metallic elements are less in number than metallic elements.
(iii) For transition elements, the 3d-orbitals are filled with electrons after the 3p-orbitals and before the 4s-orbitals.
(iv) The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.
Ans: (iii) For transition elements, the 3d-orbitals are filled with electrons after the 3p-orbitals and before the 4s-orbitals.
11. What do we call the distribution of electrons in the orbitals of an atom?
(i) Quantum mechanics.
(ii) Electron affinity.
(iii) Electronic configuration.
(iv) Ionization energy.
Ans: (iii) Electronic configuration.
12. The period number in the long form of the periodic table is equal to:
(i) Maximum Azimuthal quantum number of any element of the period.
(ii) Maximum Principal quantum number of any element of the period.
(iii) Atomic number of any element of the period.
(iv) Maximum Principal quantum number of any element of the period.
Ans: (iv) Maximum Principal quantum number of any element of the period.
13. The elements in which electrons are progressively filled in 4f-orbital are called:
(i) Actinoids.
(ii) Transition elements.
(iii) Halogens.
(iv) Lanthanoids.
Ans: (iv) Lanthanoids.
14. Which of the following subshells can hold a maximum of 10 electrons?
(i) s.
(ii) p.
(iii) d.
(iv) f.
Ans: (iii) d.
15. Which of the following is the correct order of size of the given species:
(i) I >I– >I+
(ii) I + >I– >I
(iii) I >I+ >I–
(iv) I– > I > I+
Ans: (iv) I– > I > I+
