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MCQ for NEET Chemistry Classification Of Elements and Periodicity In Properties
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Classification Of Elements and Periodicity In Properties MCQ Questions NEET Chemistry with Answers
Question: What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?
- a) +2.55 eV
- b) +10.2 eV
- c) –5.1 eV
- d) –10.2 eV
Answer: –5.1 eV
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: 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: Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?
- a) Ca < Al < C < O < F
- b) Al < Ca < O < C < F
- c) Al < O < C < Ca < F
- d) C < F < O < Al < Ca
Answer: Ca < Al < C < O < F
Question: The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2. What is the atomic number of the element, which is just below the above element in the periodic table?
- a) 36
- b) 49
- c) 50
- d) 54
Answer: 50
Question: Which of the following ion is the largest in size?
- a) K+
- b) Ca2+
- c) Cl–
- d) S–2
Answer: S–2
Question: The electronic configuration of inner transition elements is
- a) ns1
- b) ns2np5nd10
- c) ns0–2 (n – 1) d1–10 (n – 2) f1–14
- d) ns2 (n – 1) d0–1 (n – 2) f1–14
Answer: ns2 (n – 1) d0–1 (n – 2) f1–14
Question: Which of the following has the smallest size?
- a) Al3+
- b) F–
- c) Na+
- d) Mg2+
Answer: Al3+
Question: The first ionization potentials (eV) of N and O respectively are
- a) 8.29, 8.29
- b) 11.32, 11.32
- c) 8.29, 11.32
- d) 11.32, 8.21
Answer: 11.32, 8.21
Question: Which one of the following is correct order of the size of aluminium species?
- a) Al > Al+ > Al2+
- b) Al2+ > Al+ > Al
- c) Al2+ = Al+ = Al
- d) All of these
Answer: Al > Al+ > Al2+
More Questions............................................
Question: Correct order of Ist ionization potential among elements Be, B, C, N, O 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: B < Be < C < O < N
Question: An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in which group of periodic table?
- a) Fifth
- b) Fifteenth
- c) Second
- d) Third
Answer: Fifth
Question: Ionic radii are
- a) Inversely proportional to effective nuclear charge
- b) Inversely proportional to square of effective nuclear charge
- c) Directly proportional to effective nuclear charge
- d) Directly proportional to square of effective nuclear charge
Answer: Inversely proportional to effective nuclear charge
Question: Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
- a) Vanadium (Z = 23)
- b) Chromium (Z = 24)
- c) Manganese (Z = 25)
- d) Iron (Z = 26)
Answer: Manganese (Z = 25)
Question: The element with highest electronegativity 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 2, group 17
Question: The first, second and third ionisation energies of Al are 578, 1817 and 2745 kJ mol–1 respectively. Calculate the energy required to convert all the atoms of Al to Al+3 present in 270 mg of Al vapours
- a) 5140 kJ
- b) 51.40 kJ
- c) 2745 kJ
- d) 514.0 kJ
Answer: 51.40 kJ
Question: The size of ionic species is correctly given in the order
- a) Na+ > Mg+2 > Cl+7 > Si4+
- b) Na+ > Mg+2 > Si4+ > Cl+7
- c) Cl+7 > Si+4 > Mg+2 > Na+
- d) Cl+7 > Na+ > Mg+2 > Si+4
Answer: Na+ > Mg+2 > Si4+ > Cl+7
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: Be2+ is isoelectronic with which of the following ions?
- a) H+
- b) Li+
- c) Na+
- d) Mg2+
Answer: Li+
Question: The element with highest electronegativity 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 2, group 17
Question: Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
- a) Vanadium (Z = 23)
- b) Chromium (Z = 24)
- c) Manganese (Z = 25)
- d) Iron (Z = 26)
Answer: Manganese (Z = 25)
Question: Ionic radii are
- a) Inversely proportional to effective nuclear charge
- b) Inversely proportional to square of effective nuclear charge
- c) Directly proportional to effective nuclear charge
- d) Directly proportional to square of effective nuclear charge
Answer: Inversely proportional to effective nuclear charge
Question: The first ionization potentials (eV) of N and O respectively are
- a) 8.29, 8.29
- b) 11.32, 11.32
- c) 8.29, 11.32
- d) 11.32, 8.21
Answer: 11.32, 8.21
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: 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: 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: Total number of elements present in 5th period of modern periodic table is
- a) 2
- b) 8
- c) 18
- d) 32
Answer: 18
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 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 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
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