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 67 of 68
- A. HBO2
- B. HFO2
- C. H3PO3
- D. HBrO2
Explanation: HBrO2(aq) is bromous acid and HIO2(aq) is iodous acid. Like many of the oxyacids, the molecules of HBrO2 (hydrogen bromite) and HIO2…
Correct answer: HFO2- A. Charge on nucleus
- B. Screening effect
- C. Electronic configuration
- D. All of the above
Explanation: Ionization energy, also called ionization potential is the amount of energy required to remove an electron from an isolated atom or…
Correct answer: All of the above- A. XYZ
- B. XZY
- C. YXZ
- D. ZXY
Explanation: In a given period of the periodic table, the nature of oxides changes from basic to amphoteric to acidic as you move from left to right.
Correct answer: YXZ- A. Sc3+
- B. Li2+
- C. Ba3+
- D. Na+
Explanation: In aqueous medium, due to extremely large hydration energy (energy evolved when a substance is hydrolysed), in aqueous medium, Li+ is more…
Correct answer: Na+- A. Yellow Colored solution
- B. Greenish Colored solution
- C. Bluish Colored solution
- D. Colorless solution
Explanation: Chlorine gas dissolves in water, forming a greenish solution called perchloric acid.
Correct answer: Greenish Colored solution- A. Phosphoruss (iii) oxide
- B. Phosphoruss (v) oxide
- C. Phosphorus (ii) oxide
- D. Both (A) & (B)
Explanation: When white phosphorus burns in air, it undergoes a slow combustion reaction to form phosphorus (I) oxide, which is also known as…
Correct answer: Both (A) & (B)1327. Which of the following atoms in the given oxidation state have the highest electro negativity.
- A. Mo(ii)
- B. Mo(iii)
- C. Mo(v)
- D. Mo(vi)
Explanation: Students should learn the Mo(ii) has the lowest oxidation state and highest electronegativity.Compared to the other given oxidation states…
Correct answer: Mo(ii)- A. Sb3+
- B. Bi3+
- C. Sn3+
- D. Fe3+
Explanation: This is a fact Boron does not have a d orbital to stabilize its charge and thus is unstable as a cation in aqueous solution.This is a fact…
Correct answer: Bi3+- A. CrO> Cr2O3> CrO3
- B. CrO3> Cr2O3>CrO
- C. Cr2O3 >CrO>CrO3
- D. CrO3>CrO> Cr2O3
Explanation: The increasing acidic strength is in this order of oxidation state; Cr3+ > Cr2+ > Cr+1 As increasing oxidation state increases the acid…
Correct answer: CrO3> Cr2O3>CrO- A. ClO3
- B. ClO2
- C. Cl2 O7
- D. CI2 O7
Explanation: Anhydride literally means 'without water. It can be defined as the chemical compound formed by eliminating water from another compound…
Correct answer: Cl2 O7- A. Increase
- B. Decrease
- C. Increase then decrease
- D. Decrease then increase
Explanation: Ionic radius increases as you move from top to bottom on the periodic table.
Correct answer: Decrease- A. Cs
- B. Li
- C. He
- D. I
Explanation: Helium (He) has the highest first ionization energy. This means that it requires the most energy to remove an electron from a helium atom…
Correct answer: He- A. Si and Al
- B. Ca and Mg
- C. B and Ar
- D. B and Al
Explanation: Silicon (Si) and Aluminum (Al) are the two most abundant elements in the Earth's crust.
Correct answer: Si and Al- A. Transition metal
- B. Alkali metal
- C. Alkaline earth metal
- D. None of above
Explanation: Group 1 elements, known as Alkali metals, fit the criteria of forming strong base salts and stable carbonates due to their low polarizing…
Correct answer: Alkali metal- A. They are less metallic in nature
- B. There is only one valency
- C. They do not having tightly packed structures
- D. They have high IE
Explanation: Alkali metals are soft because of their large atomic size and single valence electron, leading to weaker metallic bonds between atoms.
Correct answer: They do not having tightly packed structures- A. Na
- B. Ca
- C. Sr
- D. Li
Explanation: LiNO₃ → gives Li₂O + NO₂ (brown gas) + O₂.ng.
Correct answer: Li- A. KAlSi3O8
- B. KCl·MgCl2·6H2O
- C. KCl
- D. KCl·Al2O3·2H2O
Explanation: Carnallite is a hydrated potassium magnesium chloride mineral with the chemical formula KCl·MgCl2·6H2O.
Correct answer: KCl·MgCl2·6H2O- A. Xy
- B. Xy2
- C. X1y
- D. Xy3
Explanation: The valence shell configuration of x indicates that it belongs to group I-A (the alkali metals) while the valence configuration of y…
Correct answer: Xy- A. Li2O
- B. Li2N
- C. Li2O2 + Li2CO3
- D. Both (a) & (b)
Explanation: Lithium reacts with the oxygen in the air to form lithium oxide (Li2O) and with nitrogen to form lithium nitride (Li3N).
Correct answer: Both (a) & (b)- A. Cs
- B. Rb
- C. K
- D. All of the above
Explanation: Alkali metals form oxides (O²⁻), peroxides (O₂²⁻), or superoxides (O₂⁻) depending on their size.Larger cations stabilize larger anions:Li…
Correct answer: All of the above