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 25 of 68
- A. K>Ca>Ba
- B. Ca>Ba>K
- C. Ba>K>Ca
- D. K>Ba>Ca
Explanation: The second ionization energy is the energy required to remove a second electron from an atom.
Correct answer: K>Ca>Ba- A. NR+
- B. O
- C. F
- D. O-
Explanation: The correct answer is option C: F. Fluorine has the highest electron affinity among the elements listed.
Correct answer: F- A. Cl
- B. Cl+
- C. Cl-
- D. Cl3+
Explanation: The size of an atom or ion depends on its electron configuration. Adding electrons (as in Cl-) increases repulsion between electrons and…
Correct answer: Cl-- A. Ne
- B. F
- C. O2-
- D. Na+
Explanation: Ionization energy (IE) refers to the energy required to remove an electron from a gaseous atom or ion.
Correct answer: Na+485. Which of the following iso-electronic ions would require least energy for the removal of electron?
- A. Ca2+
- B. Cl-
- C. K+
- D. Ar
Explanation: The correct answer is Cl- because it is an anion with one extra electron compared to its neutral state, reducing the effective nuclear…
Correct answer: Cl-- A. Nitrogen has half-filled p-orbitals, which provide extra stability.
- B. Nitrogen atom is smaller in size than oxygen atom.
- C. Nitrogen contains fewer electrons than oxygen.
- D. Nitrogen is less electronegative than oxygen.
Explanation: The correct answer is that the ionization energy of nitrogen is higher than that of oxygen because nitrogen has half-filled p-orbitals.
Correct answer: Nitrogen has half-filled p-orbitals, which provide extra stability.- A. Alkali metals
- B. Halogens
- C. Transition metals
- D. Inert gases
Explanation: The correct answer is Inert gases. Inert gases, also known as noble gases, have a complete valence electron shell, making them very stable…
Correct answer: Inert gases- A. F
- B. I
- C. Br
- D. Cl
Explanation: Chlorine has the highest electron affinity among the halogens. While fluorine is more electronegative, its small size results in…
Correct answer: Cl- A. C > N > O > F
- B. O > N > F > C
- C. O > F > N > C
- D. F > O > N > C
Explanation: The second ionization potential depends on the electron configuration stability after the first electron is removed.
Correct answer: O > N > F > C- A. Boron
- B. Carbon
- C. Nitrogen
- D. Oxygen
Explanation: The correct answer is Nitrogen. Nitrogen has the highest first ionization potential among the given options because its electronic…
Correct answer: Nitrogen- A. Na
- B. Al
- C. Mg
- D. Fe
Explanation: The correct answer is Fe. Iron is a transition metal, which typically means it can exhibit more than one oxidation state.
Correct answer: Fe- A. Oxygen
- B. Argon
- C. Boron
- D. Nitrogen
Explanation: The correct answer is Argon. Argon is a noble gas, which means it already has a complete valence electron shell and has no tendency to…
Correct answer: Argon- A. Metallic character
- B. Electronegativity
- C. Oxidizing behavior
- D. Reducing behavior
Explanation: The correct answer is Metallic character. As you move from top to bottom in a group, elements tend to exhibit increased metallic…
Correct answer: Metallic character- A. Sodium
- B. Magnesium
- C. Aluminum
- D. Silicon
Explanation: The third ionization energy refers to the energy required to remove the third electron from an atom.
Correct answer: Magnesium- A. Li
- B. B
- C. Na
- D. Al
Explanation: Beryllium (Be) has a diagonal relationship with Aluminum (Al). This is a phenomenon observed in the periodic table where elements in…
Correct answer: Al- A. Na
- B. Si
- C. Cl
- D. Ar
Explanation: The correct answer is Argon (Ar). In the periodic table, ionization energy generally increases across a period from left to right.
Correct answer: Ar- A. Na
- B. Ca
- C. Be
- D. Al.
Explanation: The first ionization energy generally increases across a period and decreases down a group.
Correct answer: Be- A. Group 1
- B. Group 2
- C. Group 17
- D. Group 18
Explanation: The correct answer is Group 17. In a given period, the elements in Group 17 (halogens) have the highest electron affinity.
Correct answer: Group 17- A. Period 2, group 17
- B. Period 3, group 17
- C. Period 2, group 18
- D. Period 2, group 1
Explanation: Electron affinity refers to the energy change that occurs when an electron is added to a neutral atom.
Correct answer: Period 3, group 17- A. Atomic size
- B. Nuclear charge
- C. Electronic configuration
- D. All the above
Explanation: The correct answer is D: All the above. Electron affinity is influenced by atomic size, nuclear charge, and electronic configuration.
Correct answer: All the above