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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821. Ca (Z=20) forms an ionic bond with CI (Z=17). What is the chemical formula of calcium chloride?
- A. CaCl
- B. CaCl₂
- C. Ca2CI2
- D. Ca2CI
Explanation: The electronic configuration of Ca is 1s2 2s2 2p6 3s2 3p6 4s2 3d10. Since, calcium has 20 electrons, it can lose 2 electrons to attain…
Correct answer: CaCl₂- A. Very slow
- B. Moderately slow
- C. Very fast
- D. Not occurs
Explanation: The ionic reactions of inorganic compounds are very fast because these reactions involve combination of opposite ions without involving…
Correct answer: Very fast- A. Decreases
- B. Increases
- C. Remains same
- D. Irregular trend
Explanation: Metallic property is ability of an atom to lose electrons to form positive ions.Metallic property in of p-block elements increases because…
Correct answer: Increases- A. M2O
- B. M2O4
- C. MO2
- D. M2O2
Explanation: The oxidation state of superoxide is O2^-½. Hence, the molecular formula will be MO2, where M is M^+1 and O is O^-½.
Correct answer: MO2- A. Potassium
- B. Sodium
- C. Lithium
- D. Calcium
Explanation: Sodium is known to react vigorously with water, producing hydrogen gas and a characteristic yellowish-golden flame.
Correct answer: Sodium- A. Na
- B. K
- C. Rb
- D. Li
Explanation: Lithium is the alkali metal that reacts the slowest with water among the options given.
Correct answer: Li- A. Mg
- B. Ca
- C. Rb
- D. Sr
Explanation: Magneisum has the smallest shielding effect in the given elements, because as you move alonga group(from top to bottom in the periodic…
Correct answer: Mg- A. Electronegativity
- B. Thick, small electronic cloud
- C. Seven electrons in outermost shell
- D. Higher ionization energy
Explanation: Fluorine has less electron affinity compared to bromine primarily due to its small atomic size and the associated compact 2p subshell…
Correct answer: Thick, small electronic cloud- A. HClO₄
- B. HClO₃
- C. HClO
- D. HClO₂
Explanation: The lower the oxidation state of halogen in an oxyacid, the stronger the oxidizing ability, because it can accept electrons to reach a…
Correct answer: HClO- A. Al
- B. Ca
- C. Mg
- D. Cu
Explanation: The metal that is extracted from bauxite is A. Al (aluminum).
Correct answer: Al- A. 1s2 2s2 2p3
- B. 1s2 2s2 2p4
- C. 1s2 2s2 2p1
- D. 1s2 2s2 2p2
Explanation: The element that belongs to group IIIA (Group 13) of the periodic table is boron (B), so the correct option is C: 1s2 2s2 2p1.
Correct answer: 1s2 2s2 2p1- A. Insoluble
- B. Soluble in water to give neutral solution of ph 7
- C. Soluble in water to give acidic solution of ph 1
- D. Soluble in water to give alkaline solution of ph 14
Explanation: The correct description for the metal chlorides formed when alkali metals react with chlorine gas is B.
Correct answer: Soluble in water to give neutral solution of ph 7- A. 12 moles of oxygen
- B. 15 moles of oxygen
- C. 18 moles of oxygen
- D. 21 moles of oxygen
Explanation: Option C is correct. The balanced chemical equation is: 2 KClO3(l) + heat → 2 KCl(s) + 3 O2(g).
Correct answer: 18 moles of oxygen- A. SO2 oxidizes KMnO4
- B. SO2 reduces KMnO4
- C. KMnO4 is inert in acidic medium
- D. SO2 can't undergo redox reaction
Explanation: Option B is correct as SO2 is a strong reducing agent and KMnO4 is a strong oxidising agent.
Correct answer: SO2 reduces KMnO4- A. The solubility product for Mg(OH)2 is lower than that for Ca(OH)2
- B. The atomic radius of Mg is smaller than that of Ca.
- C. Magnesium is more reactive than calcium.
- D. Calcium has a higher ionization energy than magnesium.
Explanation: This is the correct answer. As discussed previously, solubility product (Ksp) plays a crucial role in determining the extent to which an…
Correct answer: The solubility product for Mg(OH)2 is lower than that for Ca(OH)2- A. Calcium chloride
- B. Sodium chloride
- C. Potassium chloride
- D. Magnesium chloride
Explanation: This is the correct answer. In the Down's process, a small amount of calcium chloride (CaCl2) is added to molten sodium chloride (NaCl) to…
Correct answer: Calcium chloride- A. Mg(OH)2
- B. Mg(OH)
- C. MOH
- D. Mg(OH)3
Explanation: When magnesium (Mg) reacts with two molecules of water (H2O), it forms magnesium hydroxide (Mg(OH)2).
Correct answer: Mg(OH)2- A. Li: Red
- B. Na: Lilac
- C. K: Red
- D. Cs: Yellow
Explanation: Flame tests are used to identify alkali metals based on the characteristic colors they produce when burned:- Lithium (Li): Red- Sodium…
Correct answer: Li: Red- A. Boron has a higher electronic configuration than Beryllium
- B. Atomic radius of Beryllium is smaller than Boron
- C. Beryllium has a stable electronic configuration
- D. Boron has a smaller atomic number than Beryllium
Explanation: Beryllium has a stable electronic configuration - Correct. Beryllium has a fully filled 2s orbital, which is more stable and requires more…
Correct answer: Beryllium has a stable electronic configuration- A. Mg
- B. Ca
- C. Na
- D. Be
Explanation: Be - Correct. Beryllium does not react with water under normal conditions due to the formation of an oxide layer that prevents further…
Correct answer: Be