FYJC – CHEMISTRY
Date : /FEB/2025
MARKS : 25 6. MODERN PERIODIC TABLE Time :1.15 Hours
GENERAL INSTRUCTIONS:
The Question paper is divided into four sections.
(1) Section A Q.No.1 Contains Four multiple choice type of questions carrying ONE mark each.
Q.No.2 Contains Three very short answer type of questions carrying ONE mark each.
(2) Section B Q.No.3 to Q.No.8 contains Six short answer type of questions carrying TWO mark each.
(3) Section C Q.No.9 to Q.No.11 Three short answer type of questions carrying THREE mark each.
(4) Section D Q.No.12 to Q.No.13 Two long answer type of questions carrying FOUR marks each.
(5) Use of log table is allowed. Use of Calculator NOT allowed.
(6) Figures to the Right indicate full marks
(7) For Each MCQ, correct answer must be written along with its alphabet.
Eg.., (a) ……… / (b) ……… / (c) ………. / (d) ………. Only first attempt will be considered for
evaluation.
SECTION – A
Q.No.1 Select & write the correct answer: [04]
(i) In modern periodic table, the period number indicates the……….
a. Atomic number b. Atomic Mass
c. Principal quantum number d. Azimuthal quantum number
Answer: c. Principal quantum number
(ii) Consider the elements B, Al, Mg and K predict the correct order of metallic character………
a. B > Al > Mg > K b. Al > Mg > B > K
c. Mg > Al > K > B d. K > Mg > Al > B
Answer: d. K > Mg > Al > B
(iii) The lanthanides are placed in the periodic table at………….
a. Left hand side b. Right Hand side c. Middle d. Bottom
Answer: d. Bottom
(iv) In which group of elements of the modern periodic table are halogen placed?
a. 2 b. 4 c. 6 d. 17
Answer: d. 17
Page 1 of 5
, Q.No.2 Answer the following: [03]
(i) What is the general electronic configuration of p-block element?
Answer: The general electronic configuration for the p-block is ns2 np1-6.
(ii) Define Electron gain enthalpy.
Answer: The enthalpy change that takes place when an electron is added to an isolated
gaseous atom in its ground state is called the electron gain enthalpy.
(iii) Select the smaller ion from the pairs K+ & Li+
Answer: Li+ has a smaller radius than K+.
SECTION – B
Attempt Any Four : [08]
Q.3 Define ionization energy. Name the factors on which ionization energy depends?
Answer:
Definition of ionization energy:
The energy required to remove an electron from the isolated gaseous atom in its ground
state is called ionization enthalpy.
Factors on which ionization energy depends,
i. Atomic Radius
ii. Nuclear Charge
iii. Screening effect
iv. Electronic configuration
Noble gases possess relatively large atomic size. Explain
Answer:
i. Noble gases have completely filled valence shell i.e., complete octet (except He with
Q.4 complete duplet).
ii. Since their valence shell contains eight electrons, they experience greater electronic
repulsion and this results in increased atomic size (atomic radii) of the noble gas elements.
Hence, noble gases possess relatively large atomic size.
Fluorine has less electron affinity than chlorine. Explain
Answer:
i. The less electron affinity of fluorine is due to its smaller size.
Q.5 ii. Adding an electron to the 2p orbital in fluorine leads to a greater repulsion than adding
an electron to the larger 3p orbital of chlorine.
Hence, fluorine has less electron affinity than chlorine.
Define : a. Ionic radius b. Atomic Number
Answer:
Q.6 a. Ionic radius :
It is defined as the distance of the electron in the outer most shell from the center of the
nucleus in a particular ion.
Page 2 of 5
Date : /FEB/2025
MARKS : 25 6. MODERN PERIODIC TABLE Time :1.15 Hours
GENERAL INSTRUCTIONS:
The Question paper is divided into four sections.
(1) Section A Q.No.1 Contains Four multiple choice type of questions carrying ONE mark each.
Q.No.2 Contains Three very short answer type of questions carrying ONE mark each.
(2) Section B Q.No.3 to Q.No.8 contains Six short answer type of questions carrying TWO mark each.
(3) Section C Q.No.9 to Q.No.11 Three short answer type of questions carrying THREE mark each.
(4) Section D Q.No.12 to Q.No.13 Two long answer type of questions carrying FOUR marks each.
(5) Use of log table is allowed. Use of Calculator NOT allowed.
(6) Figures to the Right indicate full marks
(7) For Each MCQ, correct answer must be written along with its alphabet.
Eg.., (a) ……… / (b) ……… / (c) ………. / (d) ………. Only first attempt will be considered for
evaluation.
SECTION – A
Q.No.1 Select & write the correct answer: [04]
(i) In modern periodic table, the period number indicates the……….
a. Atomic number b. Atomic Mass
c. Principal quantum number d. Azimuthal quantum number
Answer: c. Principal quantum number
(ii) Consider the elements B, Al, Mg and K predict the correct order of metallic character………
a. B > Al > Mg > K b. Al > Mg > B > K
c. Mg > Al > K > B d. K > Mg > Al > B
Answer: d. K > Mg > Al > B
(iii) The lanthanides are placed in the periodic table at………….
a. Left hand side b. Right Hand side c. Middle d. Bottom
Answer: d. Bottom
(iv) In which group of elements of the modern periodic table are halogen placed?
a. 2 b. 4 c. 6 d. 17
Answer: d. 17
Page 1 of 5
, Q.No.2 Answer the following: [03]
(i) What is the general electronic configuration of p-block element?
Answer: The general electronic configuration for the p-block is ns2 np1-6.
(ii) Define Electron gain enthalpy.
Answer: The enthalpy change that takes place when an electron is added to an isolated
gaseous atom in its ground state is called the electron gain enthalpy.
(iii) Select the smaller ion from the pairs K+ & Li+
Answer: Li+ has a smaller radius than K+.
SECTION – B
Attempt Any Four : [08]
Q.3 Define ionization energy. Name the factors on which ionization energy depends?
Answer:
Definition of ionization energy:
The energy required to remove an electron from the isolated gaseous atom in its ground
state is called ionization enthalpy.
Factors on which ionization energy depends,
i. Atomic Radius
ii. Nuclear Charge
iii. Screening effect
iv. Electronic configuration
Noble gases possess relatively large atomic size. Explain
Answer:
i. Noble gases have completely filled valence shell i.e., complete octet (except He with
Q.4 complete duplet).
ii. Since their valence shell contains eight electrons, they experience greater electronic
repulsion and this results in increased atomic size (atomic radii) of the noble gas elements.
Hence, noble gases possess relatively large atomic size.
Fluorine has less electron affinity than chlorine. Explain
Answer:
i. The less electron affinity of fluorine is due to its smaller size.
Q.5 ii. Adding an electron to the 2p orbital in fluorine leads to a greater repulsion than adding
an electron to the larger 3p orbital of chlorine.
Hence, fluorine has less electron affinity than chlorine.
Define : a. Ionic radius b. Atomic Number
Answer:
Q.6 a. Ionic radius :
It is defined as the distance of the electron in the outer most shell from the center of the
nucleus in a particular ion.
Page 2 of 5
