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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- A. Cs
- B. Fr
- C. Li
- D. K
Explanation: Francium is radioactive because it contains unstable nuclei and is able to naturally release energy in the process of shedding high speed…
Correct answer: Fr- A. K3(AlF6)
- B. AIH3
- C. K[AIF3H]
- D. K3[AIF3H3]
Explanation: Aluminium forms fluoride complexes more easily. So, AlF3 easily dissolve in mixture of (HF+KF).AlF3 is soluble in HF due to the formation…
Correct answer: K3(AlF6)- A. Sodium and Lithium.
- B. Lithium and Magnesium.
- C. Lithium and Berylium.
- D. Boron and Beryllium.
Explanation: Lithium (Li) and magnesium (Mg) show a diagonal relationship in the periodic table.
Correct answer: Lithium and Magnesium.- A. Size of atoms
- B. Nuclear charge
- C. Number of shells
- D. All of these
Explanation: Ionization energy depends on: -atomic size -nuclear charge -shielding/screening effect -nature of orbital
Correct answer: All of these1205. The first ionization potential of alkaline earth metal is greater than alkali metals because _.
- A. They are more reactive
- B. They have greater atomic radii
- C. They have smaller atomic sizes
- D. All of the above
Explanation: In general, as we move from left to right in a period, the ionization energy of the elements increases due to successive increase in the…
Correct answer: They have smaller atomic sizes1206. What is the general trend of melting and boiling points of transition elements along the period?
- A. Increases from left to right
- B. Decreases from left to right
- C. Increases up to the middle then decreases
- D. Decreases up to the middle and then increases
Explanation: The relationship between the melting and boiling points of transition elements within a period is directly influenced by the number of…
Correct answer: Increases up to the middle then decreases- A. 3A & 4A
- B. 5A & 6A
- C. 6A & 4A
- D. 3A and 6A
Explanation: The ionization energies of group IIIA and VIA show abnormal trends because elements of these groups tend to lose electrons easily to…
Correct answer: 3A and 6A- A. Neutral, excited
- B. Excited, de-excited
- C. De-excited, excited
- D. None of these options are correct
Explanation: When a light photon arrives at the metal surface, it is absorbed. This process promotes the electrons to a higher energy level.
Correct answer: Excited, de-excited- A. J/mol
- B. KJ/mol
- C. KJ/atom
- D. J/atom
Explanation: Electron affinity is defined as the change in energy "(KJ/mol)" of a neutral atom when an electron is added to the atom to form a negative…
Correct answer: KJ/mol- A. Removed,cation
- B. Added,cation
- C. Added, anion
- D. Removed, anion
Explanation: c) Added, anion: This is the correct option. Electron affinity is the energy released when an electron is added to an atom to form an…
Correct answer: Added, anion- A. Rubidium
- B. Potassium
- C. Sodium
- D. Cesium
Explanation: Options A, B and D are incorrect as Na is the uppermost element in alkali metals and down the group, electropositive character or metallic…
Correct answer: Sodium- A. NH4+
- B. K+
- C. Mg2+
- D. Al3+
Explanation: b) K+ (potassium ion):The potassium ion (K+) produces a characteristic lilac or violet flame color during a flame test.
Correct answer: K+- A. Element sodium can be prepared and isolated by electrolyzing an aqueous solution of NaCl
- B. Elemental Na is a strong oxidizing agent
- C. Elemental Na is insoluble in NH3
- D. Elemental Na is easily oxidizing
Explanation: Good reducing agents include the active metals, such as sodium, magnesium, aluminum, and zinc, which have relatively small ionization…
Correct answer: Elemental Na is easily oxidizing- A. Low electronegativity
- B. Low melting point
- C. Their ions are isoelectronic with noble gas
- D. High ionization energy
Explanation: Alkali metals have low ionization energies due to their larger atomic radii.
Correct answer: High ionization energy- A. Electron affinity
- B. Reactivity
- C. Ionisation energy
- D. All of the above options are correct
Explanation: The reactivity of Group I elements increases as you go down the group because: the atoms get larger as you go down the group.
Correct answer: Reactivity- A. Ionization energy
- B. Reactivity
- C. Electron affinity
- D. Electronegativity
Explanation: The reactivity of alkali metals increases as you go down the group because: the atoms get larger as you go down the group.
Correct answer: Reactivity- A. NaCl
- B. NaOH
- C. NaBr
- D. ClO
Explanation: Option A: When molten sodium (Na) comes into contact with chlorine (Cl₂) gas, a vigorous reaction takes place, resulting in the formation…
Correct answer: NaCl- A. Their oxides are basic
- B. Their oxides and hydroxides are water-soluble and form alkaline solutions in water
- C. Both a & b
- D. They are found in the earth
Explanation: Option A: Their oxides are basic: This option refers to the fact that alkali metals form oxides that have basic properties.
Correct answer: Both a & b- A. Nelson's Cell
- B. Hg- Cell
- C. Castner Kellner Cell
- D. All of these
Explanation: Option A: Nelson's Cell, also called the Mercury Cell or Castner-Kellner Cell, is one type of electrolytic cell used for the production of…
Correct answer: All of these- A. NaNO3
- B. CaCO3
- C. Ba(NO3)2
- D. NH4CI
Explanation: One of the common minerals of sodium metal is Chile saltpeter. The formula for it is NaNO3.
Correct answer: NaNO3