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 33 of 68
- A. SO2 (sulfur dioxide)
- B. H2S (hydrogen sulfide) cannot be dried by concentrated sulfuric acid (H2SO4)
- C. CO2 (carbon dioxide)
- D. C2H4 (ethylene)
Explanation: Reason: H2S reacts with concentrated H2SO4, forming sulfur and water:H2S + H2SO4 → S + 2H2O
Correct answer: H2S (hydrogen sulfide) cannot be dried by concentrated sulfuric acid (H2SO4)- A. Fluorine
- B. Chlorine
- C. bromine
- D. iodine
Explanation: Fluorine's exceptional reactivity: Fluorine is the most reactive element among the halogens, and its high reactivity extends to reactions…
Correct answer: Fluorine- A. Phosphorus from phosphorite
- B. Ordinary(soda lime) glass
- C. Iron from hematite
- D. Solvay process of sodium carbonate
Explanation: The primary method for extracting phosphorus from phosphorite (Ca3(PO4)2) is carbothermal reduction, which uses coke (carbon) as the…
Correct answer: Phosphorus from phosphorite- A. Cu, Pb ,Ni
- B. Mn , Cr, Fe
- C. Cu, Ag, Au
- D. None
Explanation: Coinage metals refer to a group of metals that have been historically used to mint coins.
Correct answer: Cu, Ag, Au- A. Noble gases
- B. Halogens
- C. Heavy metals
- D. Light metals
Explanation: The elements with atomic numbers 9 (fluorine), 17 (chlorine), 35 (bromine), 53 (iodine), and 85 (astatine) belong to the halogen group.
Correct answer: Halogens- A. Ne and Ar
- B. He and Ne
- C. Ar and He
- D. Any of the noble gas can be used
Explanation: Glass lasers are formed from a combination of argon (Ar) and helium (He) gases.
Correct answer: Ar and He- A. Mn
- B. Ni
- C. Cu
- D. Zn
Explanation: Zinc (Zn) has the minimum melting and boiling point among the given options.
Correct answer: Zn- A. It is also called diaphragm cell
- B. Used for commercial preparation of NaOH
- C. The level of brine in the cathodic compartment is higher than anodic compartment
- D. Constant level device is used
Explanation: Nelson Cell, also known as the diaphragm cell, is an electrolytic cell used for the commercial preparation of sodium hydroxide (NaOH) and…
Correct answer: The level of brine in the cathodic compartment is higher than anodic compartment- A. H2S
- B. H2SO4
- C. H2O
- D. KMnO4
Explanation: Potassium permanganate (KMnO4) is both an oxidizing and reducing agent, depending on the conditions of the reaction.
Correct answer: KMnO4- A. Filtration
- B. Common ion effect
- C. Crystallization
- D. Chromatography
Explanation: Crystallization is a technique based on the different solubilities of the components in a solution.
Correct answer: Crystallization- A. to increase ionization of NH4OH due to common ion effect
- B. to decrease ionization of NH4OH due to common ion effect
- C. to increase the solubility of NH4OH in water
- D. to thicken the precipitates of hydroxides of Al3+ and Fe3+
Explanation: NH4Cl, when dissolved in water, dissociates into NH4+ and Cl- ions. When NH4Cl is added before NH4OH in the analysis of Group III cations…
Correct answer: to decrease ionization of NH4OH due to common ion effect- A. More ions can be produced due to presence of two half cells
- B. Chemical reaction between the solutions of two half cells does not take place
- C. More current can be generated due to two half cells
- D. None of the above
Explanation: In a galvanic cell, two half cells are employed to facilitate the redox reaction by separating the oxidation and reduction reactions…
Correct answer: Chemical reaction between the solutions of two half cells does not take place- A. Normal elements
- B. Less typical elements
- C. Block "p" elements
- D. Block "f" elements
Explanation: Sub-group "B" of the periodic table refers to the transition metals, which are characterized by their partially filled d orbitals.
Correct answer: Less typical elements- A. Electron affinity
- B. Energy release
- C. Energy absorption
- D. Both options A and C are correct
Explanation: When an electron is added to an atom, the energy change associated with this process is known as the electron affinity.
Correct answer: Electron affinity- A. Electron affinity
- B. Energy release
- C. Energy absorption
- D. Both options A and C are correct
Explanation: Electron affinity is defined as the energy change that occurs when a gaseous atom gains one electron to form a negatively charged ion.
Correct answer: Electron affinity- A. For chlorophyll development
- B. As fertilizer
- C. For neutralizing acidic soils
- D. To increase fruit production
Explanation: One of the important uses of lime in agriculture is for neutralizing acidic soils.
Correct answer: For neutralizing acidic soils- A. 4
- B. 3
- C. 2
- D. 1
Explanation: In the typical tetrahedral structure of quartz crystal, each oxygen atom is connected to 4 silicon atoms.
Correct answer: 4- A. II-A
- B. III-A
- C. I-A
- D. IV-B
Explanation: Li is an element of group I-A. This is because it has one valence electron, which it readily loses to form a +1 cation.
Correct answer: I-A- A. Down's cell
- B. Castner-kellner process
- C. Dutch's method
- D. Nelson's process
Explanation: Sodium is primarily prepared by the Down's cell. This method involves the electrolysis of molten sodium chloride (NaCl) to produce sodium…
Correct answer: Down's cell- A. Li₂CO₃
- B. MgCO₃
- C. Both a and b
- D. Both are stable
Explanation: Li₂CO₃ is unstable and decomposes on heating to form Li₂O and CO₂. This is because lithium is a small, highly electropositive element, and…
Correct answer: Li₂CO₃