Free s-Block and p-Block Elements MCQs with Answers
1,359 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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1,359 questions · page 22 of 68
- A. 1s22s22p63s23p1
- B. 1s22s22p63s2
- C. 1s22s22p63s1
- D. 1s22s22p63s23p2
Explanation: The correct answer is Option B: 1s22s22p63s2. This configuration is representative of a noble gas configuration (Neon, in this case) after…
Correct answer: 1s22s22p63s2- A. Ionization enthalpy increases for each successive electron removed.
- B. The greatest increase in ionization enthalpy occurs when removing an electron from a noble gas core.
- C. A significant jump in ionization enthalpy occurs after removing the last valence electron.
- D. Removing an electron from an orbital with a lower principal quantum number (n) is easier than from a higher n orbital.
Explanation: Option D is the correct answer because it incorrectly states that removing an electron from a lower n value orbital is easier than from a…
Correct answer: Removing an electron from an orbital with a lower principal quantum number (n) is easier than from a higher n orbital.- A. 3, 11, 19, 37.
- B. 5, 13, 21, 39.
- C. 7, 15, 31, 49.
- D. 5, 13, 31, 49.
Explanation: Option D is correct because it includes all the elements with atomic numbers that correspond to Group IIIA: 5 (Boron), 13 (Aluminum), 31…
Correct answer: 5, 13, 31, 49.- A. Al = Ga
- B. Zr = Hf
- C. Fe3+ < Fe2+ < Fe+
- D. All of the above
Explanation: All the options are correct, hence the choice 'All of the above' is the right answer.
Correct answer: All of the above- A. Cl, Ar
- B. Th, Pa
- C. Te, In
- D. Co, Nb
Explanation: In Mendeleev's periodic table, Th (thorium) and Pa (protactinium) form an anomalous pair because they do not adhere to the order of…
Correct answer: Th, Pa- A. 4
- B. 3
- C. 2
- D. 1
Explanation: The element with atomic number 20 is calcium. Its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2, indicating it occupies the 4th…
Correct answer: 4- A. these belong to same group.
- B. shows diagonal relationship.
- C. both has same ionization potential.
- D. both has same electron affinity.
Explanation: The correct answer is that lithium (Li) and magnesium (Mg) show a diagonal relationship, which is why they exhibit similar chemical…
Correct answer: shows diagonal relationship.- A. The properties of elements are the periodic functions of their atomic numbers.
- B. Non-metallic elements are lesser in number than metallic elements.
- C. The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number.
- D. For transition elements, the d-sub shells are filled with electrons monotonically with increase in atomic number.
Explanation: The correct answer is Option C: The first ionization energies of elements along a period do not vary in a regular manner with increase in…
Correct answer: The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number.- A. Basic medium.
- B. Bleaching agent.
- C. Neutral medium.
- D. Both in acidic and basic medium.
Explanation: The reaction Ag2O + H2O2 → 2Ag + H2O + O2 is facilitated in a basic medium.
Correct answer: Basic medium.- A. Atomic volume
- B. Metallic character
- C. Ionization energy
- D. All of the above
Explanation: The correct answer is 'All of the above' because each property listed-atomic volume, metallic character, and ionization energy-is a…
Correct answer: All of the above- A. Lothar Meyer
- B. D.I. Mendeleev
- C. J.A.R. Newlands
- D. J.W. Dobereiner
Explanation: The correct answer is J.A.R. Newlands. He proposed the Law of Octaves in 1864, observing that every eighth element shared similar…
Correct answer: J.A.R. Newlands- A. Lothar Meyer
- B. A.E. de Chancourtois
- C. Newlands
- D. Dobereiner
Explanation: The correct answer is Dobereiner. Johann Wolfgang Döbereiner proposed the concept of 'triads' in which groups of three elements have…
Correct answer: Dobereiner- A. Numbers of neutrons
- B. Atomic number
- C. Atomic weight
- D. Atomic volume.
Explanation: Mendeleev's periodic table organized elements based on increasing atomic weight, as the concept of atomic number was not yet established.
Correct answer: Atomic weight- A. Dobereiner
- B. Newlands
- C. Lothar Meyer
- D. Chancourtois
Explanation: The correct answer is Dobereiner, who proposed the Law of Triads in the early 19th century.
Correct answer: Dobereiner- A. Atomic volume with increase in atomic number
- B. Atomic volume with increase in atomic weight
- C. Atomic radii with increase in atomic weight
- D. Atomic weight with increase in atomic number.
Explanation: Lothar Meyer was one of the pioneers in recognizing the periodicity of elemental properties.
Correct answer: Atomic volume with increase in atomic weight- A. Metallic character
- B. Density
- C. Atomic size
- D. Valence electrons
Explanation: The correct answer is Option D: Valence electrons. As you descend a group in the periodic table, elements have the same number of valence…
Correct answer: Valence electrons- A. 1 (Alkali metals)
- B. 2 (Alkaline earth metals)
- C. 14 (Carbon group)
- D. 18 (Noble gases)
Explanation: The correct answer is Group 18, which consists of noble gases like helium, neon, and argon.
Correct answer: 18 (Noble gases)- A. NaCl
- B. LiCl
- C. KCl
- D. RbCl
Explanation: NaCl has the highest melting point among the given compounds. This is due to the strong electrostatic attractions between the smaller…
Correct answer: NaCl- A. 8
- B. 18
- C. 20
- D. 32
Explanation: Magic numbers are specific numbers of protons or neutrons in a nucleus, which result in more stable configurations.
Correct answer: 20- A. 32
- B. 18
- C. 8
- D. 36
Explanation: The periodic table is structured into periods and groups. Long periods refer to periods 4 and 5, each of which consists of 18 elements.
Correct answer: 18