NEET Chemistry Classification Of Elements and Periodicity In Properties MCQs Set B

Question: Modern periodic law is

• a) The physical and chemical properties of the elements are periodic function of their atomic numbers
• b) The physical and chemical properties of the elements depend upon the energy of the electrons
• c) The physical and chemical properties of the elements depend upon atomic wt.
• d) None of these

Answer: The physical and chemical properties of the elements are periodic function of their atomic numbers

Question: Which of the following statements about modern periodic table is incorrect?

• a) The p-block has 6 column because a maximum of 6 electrons can occupy all the orbitals in the p-subshell
• b) The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in the d-subshell
• c) Each block contains a number of columns equal to number of electrons that can occupy the subshell
• d) The block indicates the value of azimuthal quantum number for the last subshell which received electrons

Answer: The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in the d-subshell

Question: Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

• a) Metalloids
• b) Transition elements
• c) Non-metals
• d) Gases

Answer: Transition elements

Question: IUPAC name of element having atomic number 108 is

• a) Unniloctium
• b) Ununoctium
• c) Nilniloctinium
• d) Ununoctinium

Answer: Unniloctium

Question: Which of the following is a representative element?

• a) Zn
• b) Sr
• c) Cu
• d) Fe

Answer: Sr

Question: When a neutral atom is converted into a cation its

• a) Atomic weight increases
• b) Atomic weight decreases
• c) Size increases
• d) Size decreases

Answer: Size decreases

Question: Of the following, which one is a correct statement?

• a) Ionic radius of a metal is same as its atomic radius
• b) The ionic radius of a metal is greater than its atomic radius
• c) The atomic radius of a non-metal is more than its ionic radius
• d) The ionic radius of a metal is less than its atomic radius

Answer: The ionic radius of a metal is less than its atomic radius

Question:  Which of the following N^3–, O^2–, F^– is largest in size?

• a) N^3–
• b) O^2– 
• c) F^– 
• d) All of these

Answer: N^3–

Question: Which of the following is not correct for iso-electronic ions?

• a) They have the same number of electrons around their nuclei
• b) Higher the atomic number, higher will be positive charge in a series of isoelectronic ions of same period
• c) Isoelectronic ions have same electric charge
• d) An isoelectronic series may have both positively and negatively charged ions

Answer: Isoelectronic ions have same electric charge

Question:  The radii of F, F^–, O and O^2– are in the order

• a) O^2– > O > F^– > F 
• b) F^– > O^2– > F > O
• c) O^2– > F^– > O > F 
• d) O² > F^– > F > O

Answer:  O^2– > F^– > O > F 

Question: Which of the following is correct?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which ion has the largest radius?

• a) Se^2– 
• b) F^–
• c) O^2– 
• d) Rb⁺

Answer:  Se^2– 

More Questions............................................

Question:   The electronic configuration of an element is 1s² 2s² 2p⁶ 3s² 3p³. What is the atomic number of the element,which is just below the above element in the periodic table?

• a) 36
• b) 49
• c) 33
• d) 34

Answer: 33

Question: Which of the following has the greatest electron affinity?

• a) I
• b) Br
• c) F
• d) Cl

Answer: Cl

Question: The valence shell electronic configuration of transition elements is

• a) ns¹
• b) ns²np⁵ 
• c) ns^0–2 (n – 1) d^1–10 
• d) ns² (n – 1)d¹⁰

Answer: ns^0–2 (n – 1) d^1–10 

Question: Which one of the following is correct order of the size of iodine species?

• a) I⁺ > I^– > I 
• b) I^– > I > I⁺ 
• c) I > I^– > I⁺ 
• d) I > I⁺ > I^–

Answer:  I^– > I > I⁺ 

Question: The first ionization potentials (eV) of Be and B respectively are

• a) 8.29, 8.29
• b) 9.32, 9.32
• c) 8.29, 9.32
• d) 9.32, 8.29

Answer: 9.32, 8.29

Question: Identify the correct order of the size of the following

• a) Ca²⁺ < K⁺ < Ar < Cl^– < S^2– 
• b) Ar < Ca²⁺ < K⁺ < Cl^– < S^2–
• c) Ca²⁺ < Ar < K⁺ < Cl^– < S^2– 
• d) Ca²⁺ < K⁺ < Ar < S^2– < Cl^–

Answer:  Ca²⁺ < K⁺ < Ar < Cl^– < S^2– 

Question: Which of the following processes involves absorption of energy?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Eka-aluminium and Eka-silicon are known as

• a) Gallium and Germanium
• b) Aluminium and Silicon
• c) Iron and Sulphur
• d) Boron and Technitium

Answer: Gallium and Germanium

Question: Which of the following oxide is expected to react readily with NaOH?

• a) Na₂O 
• b) CaO
• c) NO
• d) Cl₂O₇

Answer:  Cl₂O₇

Question: The element with highest electron affinity will belong to

• a) Period 2, group 17
• b) Period 3, group 17
• c) Period 2, group 18
• d) Period 2, group 1

Answer: Period 3, group 17

Question: Energy required for the ionisation of 0.02 gram atom of magnesium is x kJ. The amount of energy required to ionise 1 atom of magnesium is

• a) x kJ
• b)

  

• c)

  

• d) xN_AkJ

Answer:

Question: Which is mismatched regarding the position of the element as given below?

• a) X(Z = 89) - f block, 6^th period  
• b) Y(Z = 100) - f block, 7^th period
• c) Z(Z = 115) - d block, 7^th period       
• d) Both (1) & (3)

Answer: Both (1) & (3)

Question:  Match the following, regarding nature of the oxides

• a) a(ii), b(i), c(iii), d(iv)
• b) a(iv), b(i), c(iii), d(ii)
• c) a(iv), b(i), c(ii), d(iii)
• d) a(ii), b(i), c(iv), d(iii)

Answer: a(iv), b(i), c(ii), d(iii)

Question: The electronic configurations of the elements X, Y, Z and J are given below. Which element has the highest metallic character?

• a) X = 2, 8, 4
• b) Y = 2, 8, 8
• c) Z = 2, 8, 8, 1
• d) J = 2, 8, 8, 7

Answer: Z = 2, 8, 8, 1

Question: The electronegativity follows the order

• a) F > O > Cl > Br
• b) F > Cl > Br > O
• c) O > F > Cl > Br
• d) Cl > F > O > Br

Answer: F > O > Cl > Br

Question:  Ca²⁺ is isoelectronic with

• a) Mg²⁺
• b) Kr
• c) Ar
• d) Na⁺

Answer: Ar

Question: An atom of an element has electronic configuration 2, 8, 1. Which of the following statement is correct?

• a) The valency of element is 7
• b) The element exists as a triatomic molecule
• c) The element is metalloid
• d) The element forms basic oxide

Answer: The element forms basic oxide

Question: The symbol of element with atomic number Z = 109

• a) Unp
• b) Uns
• c) Uno
• d) Une

Answer: Une

Question:  Pd has exceptional electronic configuration of 4d¹⁰ 5s⁰. It belong to

• a) 4^th period, group 11
• b) 5^th period, group 10
• c) 6^th period, group 9
• d) 3^rd period, group 16

Answer:  5^th period, group 10

Question: All elements in the third period have

• a) Three complete shells
• b) Three complete subshells
• c) Three valence electrons
• d) Three electrons less than octet

Answer: Three complete subshells

Question: Which one of the following represents a d-block element?

• a) [Rn] 6d¹⁰ 7s² 7p²
• b) [Xe] 4f¹ 5d¹ 6s²
• c) [Xe] 4f¹⁴ 5d¹ 6s²   
• d) [Xe] 5d¹ 6s²

Answer:  [Xe] 5d¹ 6s²

Question: The correct order of shielding effect of s, p, d and f orbitals is

• a) s > p > d > f
• b) s < p < d > f
• c) s < p < d < f
• d) s > p < d < f

Answer: s > p > d > f

Question: Which of the following set of atomic number represents only representative elements?

• a) 55, 12, 48, 53
• b) 13, 23, 54, 83
• c) 3, 33, 53, 87
• d) 22, 33, 55, 66

Answer: 3, 33, 53, 87

Question: Which of the following pairs of atomic numbers represents elements belonging to the same group?

• a) 11 and 20
• b) 12 and 30
• c) 13 and 31
• d) 14 and 33

Answer: 13 and 31

Question: Which of the following statement is incorrect?

• a) The ionization potential of nitrogen is greater than that of oxygen
• b) The electron affinity of fluorine is greater than that of chlorine
• c) The ionization potential of Mg is greater than aluminium
• d) The electronegativity of fluorine is greater than that of chlorine

Answer: The electron affinity of fluorine is greater than that of chlorine

Question: Total number of elements present in 5th period of modern periodic table is

• a) 2
• b) 8
• c) 18
• d) 32

Answer: 18

Question: The electronic configuration having maximum difference in first and second ionization energies is

• a) 1s² 2s² 2p⁶ 3s²
• b) 1s² 2s² 2p⁶ 3s² 3p¹
• c) 1s² 2s² 2p⁶ 3s² 3p²  
• d) 1s² 2s² 2p⁶ 3s¹

Answer:  1s² 2s² 2p⁶ 3s¹

Question: Increase in atomic size down the group is due to

• a) Increase in number of orbit
• b) Increase in number of protons and neutrons
• c) Increase in number of protons
• d) Increase in number of protons, neutrons and electrons

Answer: Increase in number of orbit

Question: In which of the following pairs the radii of second species is greater than that of first?

• a) K, Ca
• b) H, He
• c) Mg⁺, Mg²⁺ 
• d) O^2–, O^–

Answer: H, He

Question:   The successive ionization energies for element X is given below

Find out the number of valence electrons for the element X.

• a) 3
• b) 4
• c) 2
• d) 1

Answer: 1

Question:  If you are given Avogadro’s number of atoms of a gas ‘X’. If half of the atoms are converted into X_(g)⁺ by energy ΔH. The IE of X is 

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Find the formula of halide of a metal whose successive ionization enthalpies are x, 2x, 5x, 100x kJ mol^–1 respectively

• a) MX
• b) MX₂
• c) MX₃
• d) M₂X

Answer: MX₃

Question: Which of the following equation represents first enthalpy of ionization ?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   The energy required to convert all atoms present in 1.2 g magnesium to Mg²⁺ ions if IE, and IE₂ of magnesium are 120 kJ mol^–1 and 240 kJ mol^–1 respectively

• a) 18 kJ
• b) 36 kJ
• c) 360 kJ
• d) 24 kJ

Answer: 18 kJ

Question: The process requiring absorption of energy is

• a)  F → F^–
• b) H →H⁺ 
• c) Cl  → Cl^– 
• d) O → O^–

Answer:  H →H⁺ 

Question:  The successive ionization energies for element X is given below

Find out the number of valence electrons for the element X.

• a) 3
• b) 4
• c) 2
• d) 1

Answer: 1

Question: Which of the following is correct order of metallic character for Si, Be, Mg, Na and P?

• a) P < Si < Be < Na < Mg
• b) P < Si < Be < Mg < Na
• c) Na > Be > Mg > Be > P
• d) Na > Si > Mg > Be > P

Answer: P < Si < Be < Mg < Na

Question: The least electronegative element has the following electronic configuration

• a) ns²np⁵ 
• b) ns²np⁴ 
• c) ns²np³
• d) ns²np⁶

Answer:  ns²np⁶

Question: With which of the following electronic configuration an atom has the lowest ionization enthalpy?

• a) 1s² 2s² 2p³ 
• b) 1s² 2s² 2p⁶ 3s¹ 
• c) 1s² 2s² 2p⁶ 
• d) 1s² 2s² 2p⁵

Answer:  1s² 2s² 2p⁶ 3s¹ 

Question: Identify the wrong statement in the following.

• a) Atomic radius of the elements increases as one moves down the first group of the periodic table
• b) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table
• c) Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
• d) Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

Answer: Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

Question:  The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

• a) K⁺ < Ar < Ca²⁺ 
• b) Ar < K⁺ < Ca²⁺ 
• c) Ca²⁺ < Ar < K⁺ 
• d) Ca²⁺ < K⁺ < Ar

Answer:  Ca²⁺ < K⁺ < Ar

Question: Which of the following orders of ionic radii is correctly represented ?

• a) H^– > H⁺ > H
• b) Na⁺>F^–>O^2– 
• c) O^2– > F^– > Na⁺
• d) Al³⁺>Mg²⁺>N^3–

Answer:  O^2– > F^– > Na⁺

Question: Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?

• a) Cl < F < O < S
• b) O < S < F < Cl
• c) F < S < O < Cl
• d) S < O < Cl < F

Answer: O < S < F < Cl

Question: Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

• a) Mg < Ca < Cl < P
• b) Cl < P < Mg < Ca
• c) P < Cl < Ca < Mg
• d) Ca < Mg < P < Cl

Answer: Cl < P < Mg < Ca

Question: The correct order of the decreasing ionic radii among the following is electronic species are

• a) Ca²⁺ > K⁺ > S^2– > Cl^– 
• b) Cl^– > S^2– > Ca²⁺ > K⁺ 
• c) S^2– > Cl^– > K⁺ > Ca²⁺ 
• d) K⁺ > Ca²⁺ > Cl^– > S^2–

Answer: S^2– > Cl^– > K⁺ > Ca²⁺ 

Question: Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

• a) Cl < F < S < O
• b) O < S < F < Cl
• c) S < O < Cl < F
• d) F < Cl < O < S

Answer: O < S < F < Cl

Question: Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy?

• a) Ne [3s²3p²] 
• b) Ar [3d¹⁰4s²4p³] 
• c) Ne [3s²3p¹] 
• d) Ne [3s²3p³]

Answer:  Ne [3s²3p³]

Question: Identify the correct order of the size of the following

• a) Ca²⁺ < Ar < K⁺ < Cl^– < S^2– 
• b) Ca²⁺ < K⁺ < Ar < S^2– < Cl^–
• c) Ca²⁺ < K⁺ < Ar < Cl^– < S^2– 
• d) Ar < Ca²⁺ < K⁺ < Cl^– < S^2–

Answer:  Ca²⁺ < K⁺ < Ar < Cl^– < S^2–