NCERT MCQ CLASS-11 CHAPTER-3 | CHEMISTRY NCERT MCQ | | CHEMISTRY PART 1 | | CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES | EDUGROWN

In This Post we are  providing Chapter-3 Classification of Elements and Periodicity in Properties NCERT MCQ for Class 11 Chemistry which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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: (b) Be > Mg > Ca

Question 2.
The increasing order of the a atomic 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: (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: (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: (d) Cs < Rb < Na

Question 5.
Correct order of radii is
(a) N < Be < B
(b) F^– < O^2- < N^3-
(c) Na < Li < K
(d) Fe³⁺ < Fe²⁺ < Fe⁴⁺

Answer: (b) F^– < O^2- < N^3-

Question 6.
Set containing isoelectronic species is
(a) C2−2, NO⁺, CN^–, O2+2
(b) CO, NO, O₂ CN^–
(c) CO₂, NO₂, O₂, N₂O
(d) CO, CO₂, NO, NO₂

Answer: (a) C2−2, NO⁺, CN^–, O2+2

Question 7.
Which of the following is most electronegative?
(a) Carbon
(b) Silicon
(c) Lead
(d) Tin

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: (b) 72.24%

Question 9.
Tick the correct order of second ionization 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: (b) O > F > N > C

Question 10.
Consider the isoelectronic series : K⁺, S^2-, Cl^1- and Ca²⁺, the radii of the ions decrease as
(a) Ca²⁺ < K⁺ > Cl^–, S^2-
(b) Cl^– > S^2- > K⁺ > Ca²⁺
(c) S^2- > Cl^– > K⁺ > Ca²⁺
(d) K⁺ > Ca²⁺ > S^2- > Cl.

Answer: (c) S^2- > Cl^– > K⁺ > Ca²⁺

Question 11.
The radii of F, F^–, O, D^2- are the order of
(a) O^2- > F^– > F > O
(b) F^– > O^2- > F > O
(c) O^2- > O > F^– > F
(d) O^2- > F^– > O > F

Answer: (d) O^2- > F^– > O > F

Question 12.
Among the following groupings which represents the collection of isoelectronic species.
(a) NO⁺, C2−2, CO−2, CO
(b) N₂, C2−2, CO, NO
(c) CO, NO⁺, CN^–, C2−2
(d) NO, CN^–, N₂, O−2

Answer: (c) CO, NO⁺, CN^–, C2−2

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: (d) atomic numbers.

Question 14.
The ions O²⁺, F^–, Na⁺, Mg²⁺ and Al³⁺ are isoelectronic, their ionic radii show.
(a) a significant increase from O^2- to Al³⁺
(b) an increase from O^2- to F^– and then decrease from Na⁺ to Al³⁺
(c) a significant decrease from O^2- to Al³⁺
(d) a decrease from O^2- to F^– and then increase from Na⁺ to Al³⁺.

Answer: (c) a significant decrease from O^2- to Al³⁺

Question 15.
The ionic radii of isoelectronic species N^3-, O^2- 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: (c) 1.71, 1.40, 1.36

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