Ncert Solutions for Class 11 Chemistry Chapter 3 Meritnation
We have compiled the NCERT MCQ Questions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 11 Chemistry with Answers on a daily basis and score well in exams. Refer to the Classification of Elements and Periodicity in Properties Class 11 MCQs Questions with Answers here along with a detailed explanation.
Classification of Elements and Periodicity in Properties Class 11 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
The set representing the correct order of first ionization potential is
(a) K > Na > Li
(b) Be > Mg > Ca
(c) B > C > N
(d) Ge > Si > C.
Answer
Answer: (b) Be > Mg > Ca
Question 2.
The increasing order of the a tomifc radius for the elements Na, Rb, K and Mg is
(a) Na < K < Mg < Rb
(b) K < Na < Mg < Rb
(c) Na < Mg < K < Rb
(d) Mg < Na < K < Rb
Answer
Answer: (d) Mg < Na < K < Rb
Question 3.
The correct' order of the first ionization potentials among the following elements: Be, B, C, N Q is
(a) B < Be < C < O < N
(b) B < Be < C < N < O
(c) Be < B < C < N < O
(d) Be < B < C < O < N
Answer
Answer: (a) B < Be < C < O < N
Question 4.
Correct order of ionization enthalpies is
(a) Zn < Cd < Hg
(b) Cd < Hg < Zn
(c) Na > Cs > Rb
(d) Cs < Rb < Na
Answer
Answer: (d) Cs < Rb < Na
Question 5.
Correct order of radii is
(a) N < Be < B
(b) F– < O2- < N3-
(c) Na < Li < K
(d) Fe3+ < Fe2+ < Fe4+
Answer
Answer: (b) F– < O2- < N3-
Question 6.
Set containing isoelectronic species is
(a) C\(_{2}^{2-}\), NO+, CN–, O\(_{2}^{2+}\)
(b) CO, NO, O2 CN–
(c) CO2, NO2, O2, N2O
(d) CO, CO2, NO, NO2
Answer
Answer: (a) C\(_{2}^{2-}\), NO+, CN–, O\(_{2}^{2+}\)
Question 7.
Which of the following is most electronegative?
(a) Carbon
(b) Silicon
(c) Lead
(d) Tin
Answer
Answer: (a) Carbon
Question 8.
The values of electronegativity of atoms A and B are 1.20 and 4.0 respectively. The percentage of ionic character of A-B bond is
(a) 50%
(b) 72.24%
(c) 55.3%
(d) 43%
Answer
Answer: (b) 72.24%
Question 9.
Tick the correct order of second ionisation energy in the following
(a) F > O > N > C
(b) O > F > N > C
(c) O > N > F > C
(d) C > N > O > F
Answer
Answer: (b) O > F > N > C
Question 10.
Consider the isoelectronic series : K+, S2-, Cl1- and Ca2+, the radii of the ions decrease as
(a) Ca2+ < K+ > Cl–, S2-
(b) Cl– > S2- > K+ > Ca2+
(c) S2- > Cl– > K+ > Ca2+
(d) K+ > Ca2+ > S2- > Cl.
Answer
Answer: (c) S2- > Cl– > K+ > Ca2+
Question 11.
The radii of F, F–, O, D2- are the order of
(a) O2- > F– > F > O
(b) F– > O2- > F > O
(c) O2- > O > F– > F
(d) O2- > F– > O > F
Answer
Answer: (d) O2- > F– > O > F
Question 12.
Among the following groupings which represents the collection of isoelectronic species.
(a) NO+, C\(_{2}^{2-}\), CO\(_{2}^{-}\), CO
(b) N2, C\(_{2}^{2-}\), CO, NO
(c) CO, NO+, CN–, C\(_{2}^{2-}\)
(d) NO, CN–, N2, O\(_{2}^{-}\)
Answer
Answer: (c) CO, NO+, CN–, C\(_{2}^{2-}\)
Question 13.
According to the periodic law of elements the variation in properties of elements is related to their
(a) nuclear neutron-proton number ratio
(b) atomic masses
(c) nuclear masses
(d) atomic numbers.
Answer
Answer: (d) atomic numbers.
Question 14.
The ions O2+, F–, Na+, Mg2+ and Al3+ are isoelectronic, their ionic radii show.
(a) a significant increase from O2- to Al3+
(b) an increase from O2- to F– and then decrease from Na+ to Al3+
(c) a significant decrease from O2- to Al3+
(d) a decrease from O2- to F– and then increase from Na+ to Al3+.
Answer
Answer: (c) a significant decrease from O2- to Al3+
Question 15.
The ionic radii of isoelectronic species N3-, O2- and F– in Å are in the order.
(a) 1.36, 1.40, 1.71
(b) 1.36, 1.71, 1.40
(c) 1.71, 1.40, 1.36
(d) 1.71, 1.36, 1.40
Answer
Answer: (c) 1.71, 1.40, 1.36
Question 16.
Which of the following groupings represents a collection of isoelectronic species? [At. Nos. Cs = 55, Br = 35]
(a) Ca2+, Cs–, Br
(b) Na+, Ca2+, Mg2+
(c) N3-, F–, Na+
(d) Be, Al3+, Cl–
Answer
Answer: (c) N3-, F–, Na+
Question 17.
Identify the least stable ion amongst the following.
(a) Li–
(b) Be–
(c) B–
(d) Cr–
Answer
Answer: (b) Be–
Question 18.
The group of elements in which the differentiating electron enters the antepenultimate shell of the atoms are called
(a) f-block
(b) p-block
(c) s-block
(d) d-block
Answer
Answer: (a) f-block
Question 19.
Pick out the isoelectronic structures from the following
(I) CH\(_{3}^{+}\)
(II) H3O+
(III) NH3
(IV) CH\(_{3}^{-}\)
(a) I and II
(b) III and IV
(c) I and III
(d) II, III and IV
Answer
Answer: (d) II, III and IV
Question 20.
Eka-alurninium and Eka-silicon are known as
(a) GalliAn and germanium
(b) Aluminium and silicon
(c) Iron and sulphur
(d) Neutron and magnesium
Answer
Answer: (a) GalliAn and germanium
Question 21.
Element with atomic number 56 belongs to which block?
(a) s
(b) p
(c) d
(d) f
Answer
Answer: (a) s
Question 22.
Which of the following is the smallest cation?
(a) Na+
(b) Mg2+
(c) Ca2+
(d) Al3+
Answer
Answer: (d) Al3+
Question 23.
The first ionisation energy for Li is 5.4 eV and electron affinity of Cl is 3.61 eV. The ∆H (in k] mol-1) for the reaction.
Li (g) + Cl (g) → Li+ (g) + Cl– (g) if the resultant ions do not combine with each other is [1eV = 1.6 × 10-19 J]
(a) 70
(b) 100
(c) 170
(d) 270
Answer
Answer: (c) 170
Question 24.
Which of the following processes involves absorption of energy?
(a) Cl + e– → Cl–
(b) O– + e– → O2-
(c) O + e– → O–
(d) s + e– → s–
Answer
Answer: (b) O– + e– → O2-
Question 25.
In which of the following compounds does che ratio of the anion si/e to cation size has the lowest value?
(a) CsI
(b) Li I
(c) LiF
(d) CsF
Answer
Answer: (d) CsF
Question 26.
Which of the following represents most electropositive element?
(a) [He]2s1
(b) [He]2s²
(c) [Xe]6s1
(d) [Xe]6s²
Answer
Answer: (c) [Xe]6s1
Question 27.
An element with atomic number 106 has been discovereq recently. Which of the following electronic configuration will it have
(a) [Rn]5f146d47s²
(b) [Rn]5f146d57s1
(c) [Rn]5f14 6d67s0
(d) 5f146d7s²7p³
Answer
Answer: (a) [Rn]5f146d47s²
Question 28.
If the ionic radii of K+ and F– are about 1.34 Å each, then the expected values of atomic radii of K and F should be respectively
(a) 2.31 and.0.64 Å
(b) 2.31 and 1.34 Å
(c) 0.64 and 2.31 Å
(d) 1.34 and 1,34 Å
Answer
Answer: (a) 2.31 and.0.64 Å
Question 29.
Total number of elements present in the 3rd period is
(a) 6
(b) 32
(c) 18
(d) 8
Answer
Answer: (d) 8
Question 30.
The number of periods in the periodic table is
(a) 6
(b) 7
(c) 8
(d) 10
Answer
Answer: (b) 7
Question 31.
Total number of vertical columns (groups) in the long form of the periodic table is
(a) 8
(b) 18
(c) 17
(d) 16
Answer
Answer: (b) 18
Question 32.
The general outer electronic configuration of transition elements is
(a) ns²nd1-10
(b) ns²np1(n – 1)d1-10
(c) ns²np6(n – 1)d1-10
(d) ns0-2 (n – 1)d1-10
Answer
Answer: (d) ns0-2 (n – 1)d1-10
Question 33.
The correct order of electron affinities is
(a) 0 > S > Se
(b) 0 < S < Se
(c) 0 < Se < S
(d) S < Se < 0
Answer
Answer: (c) 0 < Se < S
Question 34.
The first ionisation energy will be maximum for
(a) Uranium
(b) Hydrogen
(c) Lithium
(d) Iron
Answer
Answer: (b) Hydrogen
Question 35.
Which of the following has least electron affinity?
(a) Oxygen
(b) Argon
(c) Nitrogen
(d) Boron
Answer
Answer: (b) Argon
Question 36.
The elements in which 4f orbitals are progressively filled are called
(a) Actinides
(b) Transitibn elements
(c) Lanthanides
(d) Halogens
Answer
Answer: (c) Lanthanides
Question 37.
The band length in LiF will be
(a) Less than that of NaF
(b) Equal to that of KF
(c) More than that of KF
(d) Equal to that of NaF
Answer
Answer: (a) Less than that of NaF
Question 38.
The ionic radius of Cr is minimum in which of the following compounds?
(a) K2CrO4
(b) CrF3
(c) CrO2
(d) CrCl3
Answer
Answer: (a) K2CrO4
Question 39.
Which of the following atoms would be paramagnetic?
(a) Ca
(b) Be
(c) Zn
(d) N
Answer
Answer: (d) N
Question 40.
Which one of the following is the Correct order of size?
(d) I > I– > I+
(b) I > I+ > I–
(c) I+ > I– > 1
(d) I– > I > I+
Answer
Answer: (d) I– > I > I+
Fill in the Blanks
Question 1.
According to modern-periodic law, the properties of the elements are a periodic function of their ………………….
Answer
Answer: Atomic numbers
Question 2.
The cause of periodicity in properties of the elements is …………………. electronic configuration in the valence shells of their atoms.
Answer
Answer: Similar
Question 3.
The elements of group 16 are called as ………………….
Answer
Answer: Chalcogens
Question 4.
Size of the atoms …………………. from left to right across a period and …………………. and descending a group.
Answer
Answer: decreases, increases
Question 5.
The vertical columns in periodic table are called …………………. These are …………………. in all.
Answer
Answer: groups, 18
Question 6.
Electronegativity generally …………………. in going from left to right across a period and …………………. in going from top to bottom in a group.
Answer
Answer: increases, decreases
Question 7.
In the long form of the periodic table each period starts with an …………………. metal and ends with a ………………….
Answer
Answer: alkali, noble gas
Question 8.
Metallic character …………………. as we move down a group and …………………. as we go from left to right across a period.
Answer
Answer: increases, decreases
Question 9.
The atomic radius of potassium is …………………. than that of lithium.
Answer
Answer: larger
Question 10.
Lithium …………………. with magnesium in its properties because it has …………………. relationship with it.
Answer
Answer: resembles, diagonal
True or False Statements
Question 1.
The size of Cl– ion Is smaller than that of S2- ion.
Answer
Answer: True
Question 2.
The decreasing order of electron affinity of F, Cl, Br is F > Cl > Br.
Answer
Answer: False
Question 3.
The first ionisation enthalpy of N is lower than that of O.
Answer
Answer: False
Question 4.
The size decreases as Cu > Cu+ > Cu2+.
Answer
Answer: True
Question 5.
An element with atomic number 46 is a transition element.
Answer
Answer: True
Question 6.
The element Hafnium (Hf) with atomic number 72 belongs to f-block.
Answer
Answer: False
Question 7.
The second electron gain enthalpy of oxygen is negative.
Answer
Answer: False
Question 8.
There are 7 periods and 18 groups in the long form of Periodic Table.
Answer
Answer: True
Question 9.
Fe3+ has more unpaired electrons than Fe2+.
Answer
Answer: True
Question 10.
The radii of Fe, Fe3+, Fe2+ decrease in the order Fe > Fe2+ > Fe3+.
Answer
Answer: True
Match Type Questions
| Column I | Column II |
| 1. 21Sc to 30Zn | (a) 4d series |
| 2. 39Y to 48Cd | (b) 3d series |
| 3. 57La, 72Hf to 80Hg | (c) 6d series |
| 4. 89AC, 104Ku, 105Ha, 112Eka | (d) Actinide series |
| 5. 90Th to 103Lr | (e) 5d series |
Answer
Answer:
| Column I | Column II |
| 1. 21Sc to 30Zn | (b) 3d series |
| 2. 39Y to 48Cd | (a) 4d series |
| 3. 57La, 72Hf to 80Hg | (e) 5d series |
| 4. 89AC, 104Ku, 105Ha, 112Eka | (c) 6d series |
| 5. 90Th to 103Lr | (d) Actinide series |
| Column I | Column II |
| 1. 13 | (a) ns²np² |
| 2. 14 | (b) ns²np1 |
| 3. 15 | (c) ns²np5 |
| 4. 16 | (d) ns²np4 |
| 5. 17 | (e) ns²np³ |
Answer
Answer:
| Column I | Column II |
| 1. 13 | (b) ns²np1 |
| 2. 14 | (a) ns²np² |
| 3. 15 | (e) ns²np³ |
| 4. 16 | (d) ns²np4 |
| 5. 17 | (c) ns²np5 |
Hope the information shed above regarding NCERT MCQ Questions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 11 Chemistry Classification of Elements and Periodicity in Properties MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.
Ncert Solutions for Class 11 Chemistry Chapter 3 Meritnation
Source: https://www.learncram.com/cbse/mcq-questions-for-class-11-chemistry-chapter-3/