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 12 of 68
- A. liquification process
- B. Bosch Process
- C. Fragmentation
- D. Thermal decomposition
Explanation: In the Bosch process, steam reacts with carbon monoxide in water gas: CO + H2O → CO2 + H2.
Correct answer: Bosch Process- A. Bosch Process
- B. Cyber Twinkling process
- C. Palladium process
- D. Steam process
Explanation: The Bosch process separates hydrogen from water gas by converting CO into CO2 with steam.
Correct answer: Bosch Process- A. PbS
- B. HgS
- C. AS2S3
- D. FeS2
Explanation: Galena is the principal ore of lead and has the formula PbS, lead(II) sulfide. HgS is cinnabar, As2S3 is orpiment, and FeS2 is pyrite.
Correct answer: PbS- A. Zero
- B. 20
- C. 80
- D. 70
Explanation: A lead pencil contains graphite, a form of carbon, mixed with clay and sometimes wax, so it contains no metallic lead.
Correct answer: Zero- A. Flurocarbon
- B. Carbon monoxide
- C. Methane
- D. C2H2
Explanation: Incomplete combustion in jet engines can produce carbon monoxide, CO, a poisonous gas that binds strongly with haemoglobin and reduces…
Correct answer: Carbon monoxide- A. SO2
- B. H2S
- C. CO2
- D. C2H4
Explanation: Concentrated H2SO4 cannot dry H2S because it oxidises H2S to sulfur, while itself being reduced: H2S + H2SO4 -> S + SO2 + 2H2O.
Correct answer: H2S- A. P2O3
- B. P2O5
- C. H3PO3
- D. All have same smell
Explanation: P2O3, more accurately written as P4O6, has a garlic-like odour because it is a volatile phosphorus(III) oxide.
Correct answer: P2O3- A. Lead pencils
- B. Abrasive
- C. Lubricant
- D. Electrode of electrolytic cell
Explanation: Graphite is used in pencil leads, as a lubricant, and as an electrode because its layered structure allows the layers to slide and its…
Correct answer: Abrasive- A. an acid
- B. a dehydrating agent
- C. an oxidizing agent
- D. as sulphonating agent
Explanation: Concentrated sulphuric acid removes water from ethanol, promoting dehydration to ethene: C2H5OH → C2H4 + H2O.
Correct answer: a dehydrating agent- A. it combines with H2O to form carbonic acid
- B. it reacts with red blood cells of haemoglobin
- C. it is powerful oxidizing agent
- D. it is used to prepare aerated drinks
Explanation: Carbon monoxide binds strongly with haemoglobin to form carboxyhaemoglobin, reducing the blood's ability to carry oxygen.
Correct answer: it reacts with red blood cells of haemoglobin- A. carbon is non-metal while silicon is semi-metal
- B. CO2 is an independent molecule while SiO2 has network covalent structure
- C. CO2 forms multiple bond while silicon does not form multiple bonds
- D. Silicon has all sigma bonds
Explanation: CO2 exists as small, independent linear molecules, so the weak intermolecular forces allow it to remain a gas.
Correct answer: CO2 is an independent molecule while SiO2 has network covalent structure- A. Lubricants
- B. Hydraulic brakes
- C. Antifreeze
- D. Water repellent
Explanation: Silicon-based silicones are used as lubricants, hydraulic fluids and water repellents, but antifreeze is not a standard use of silicon or…
Correct answer: Antifreeze- A. Si
- B. Ge
- C. Se
- D. Sn
Explanation: Silicon and germanium are metalloids with semiconducting behaviour, whereas tin is a metal and is not classified as a semiconductor under…
Correct answer: Sn- A. iron
- B. copper
- C. aluminium
- D. zinc
Explanation: Aluminium is used in thermite because it has a strong affinity for oxygen and removes oxygen from metal oxides, releasing enough heat to…
Correct answer: aluminium- A. H2SnO3
- B. H2SiO3
- C. H3AsO4
- D. H3SbO4
Explanation: Metasilicic acid has the formula H2SiO3, commonly represented as SiO(OH)2, whereas orthosilicic acid is H4SiO4.
Correct answer: H2SiO3- A. Ch3
- B. OH
- C. OCH3
- D. O2
Explanation: The intended comparison is between silicone and silica: silicone polymers contain repeating Si-O units with organic groups such as CH3…
Correct answer: Ch3- A. Acidic oxide
- B. Basic oxide
- C. Amphoteric oxide
- D. It does not exists
Explanation: Aluminium oxide reacts with both acids and bases, forming aluminium salts with acids and aluminates with bases, so it is amphoteric.
Correct answer: Amphoteric oxide- A. Heat resistant
- B. Low melting
- C. Used to prepare chemical garden
- D. Green in colour
Explanation: Borate and borosilicate glasses contain boron oxide, which produces a strong, chemically resistant network with a low coefficient of…
Correct answer: Heat resistant- A. More soluble in cold water
- B. More soluble in hot water
- C. Insoluble in water
- D. Soluble only in organic solvents
Explanation: Borax dissolves more readily as temperature increases, so it is more soluble in hot water than in cold water.
Correct answer: More soluble in hot water- A. Molecular addition compounds
- B. Molecular crystals
- C. Semiconductors
- D. Ionic compounds
Explanation: Boron is electron deficient because it has only three valence electrons, so it readily forms electron-accepting molecular addition…
Correct answer: Molecular addition compounds