Free Reactions of Group IV Elements MCQs with Answers

• A. metallic carbon to non metallic lead
• B. non metallic carbon through metalloid silicon and germanium to metallic tin and lead
• C. entirely metallic throughout
• D. entirely non metallic throughout

Explanation: Carbon is a non metal, silicon and germanium are metalloids used as semiconductors, and tin and lead are true metals, so group IV shows…

• A. decreases down the group
• B. is the same throughout
• C. is zero for all members
• D. increases down the group, so lead two compounds are more stable than lead four

Explanation: This is the inert pair effect: the two s electrons of the outer shell become progressively harder to involve in bonding as the group is…

• A. is small, has no available d orbitals and forms strong multiple bonds with itself
• B. has a much larger atomic radius
• C. is a metal
• D. has a full outer shell

Explanation: Its small size lets carbon form stable double and triple bonds and catenate into long chains, which is the basis of the whole of organic…

• A. CO²+O²
• B. CO+H²(water gas)
• C. CO³+H²O
• D. Laughing Gas

Explanation: Steam reforming of a hydrocarbon such as methane over nickel at about 900 °C gives carbon monoxide and hydrogen: CH4 + H2O → CO + 3H2.

• A. Peat
• B. Lignite
• C. Bituminous
• D. Anthracite

Explanation: Bituminous coal is commonly called soft coal because it is relatively soft and contains more volatile matter than anthracite.

• A. NaOH
• B. Cl²
• C. H²S
• D. Cu

Explanation: A Kipp apparatus generates gases on demand by allowing an acid to react with a solid such as iron sulfide; iron sulfide with dilute…

• 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.

• 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.

• 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.

• 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.

• 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…

• 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.

• 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.

• 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…

• 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.

• 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.

• 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.

• 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…

• 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…

• 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…