Carbon allotropes, oxides of carbon

37 questions on Carbon allotropes, oxides of carbon from the p-Block Elements: Groups 13 and 14 chapter: 8 NEET level, 14 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

• The hybridisation of each carbon atom in graphite is NEET level
• Which of the following non-metals is a good conductor of electricity? NEET level
• The number of five-membered rings in one molecule of buckminsterfullerene, C60, is NEET level
• Water gas is a mixture of NEET level
• The in-plane C--C bond length in graphite (about 141.5 pm) is shorter than the C--C bond length in diamond (about 154 pm). The best explanation is that JEE Main level
• Carbon monoxide forms stable metal carbonyls such as Ni(CO)4 mainly because CO JEE Main level
• Which of the following statements about carbon dioxide are correct? JEE Main level
• Assertion (A): Graphite is used as a dry lubricant. Reason (R): The layers of graphite are held together by strong covalent bonds. JEE Main level
• Consider: (i) CO is a neutral oxide; (ii) CO2 and N2O are isoelectronic; (iii) at 1 atm and room temperature graphite is the thermodynamically stable form of ca... JEE Main level
• When CO2 is bubbled continuously through clear lime water, a milky turbidity first appears and then disappears. The species responsible for the clear solution i... JEE Main level
• A 7.30 g sample of pure NaHCO3 is heated strongly until it is completely decomposed: 2NaHCO3 -> Na2CO3 + CO2 + H2O. Using atomic masses H = 1, C = 12, O = 16, N... JEE Main level
• Which of the following statements about the fullerene C60 are correct? JEE Advanced level
• Which is the correct order of C--O bond length in CO, CO2 and CO3^2-? JEE Advanced level
• Carbon monoxide reacts with chlorine in the presence of light or charcoal to give a compound X. Complete hydrolysis of X gives acidic products. Which option cor... JEE Advanced level
• Red-hot coke is treated with steam to give water gas, and then all the CO formed is reacted with more steam (CO + H2O -> CO2 + H2). Starting from 1 mol of carbo... JEE Advanced level
• Which of the following statements about carbon monoxide are correct? JEE Advanced level
• Which set correctly describes Ni(CO)4? JEE Advanced level
• In a single layer of graphite (treat the layer as an infinite honeycomb), each carbon atom is shared by three hexagons and each C--C bond is shared by two hexag... JEE Advanced level
• Diamond has a face-centred cubic arrangement of carbon atoms with four more carbons in alternate tetrahedral voids. If the cubic cell edge is 357 pm, the C--C b... JEE Advanced level
• The hybridisation state of carbon atoms in graphite is NEET level
• Which allotrope of carbon is a good conductor of electricity? NEET level
• Carbon monoxide is highly poisonous because it NEET level
• The fullerene C60 has a cage structure made up of NEET level
• Carbon monoxide is isoelectronic with which of the following, and what is its bond order from molecular orbital theory? JEE Main level
• When CO2 is passed continuously through lime water, the milkiness first appears and then disappears. The clear solution contains JEE Main level
• A convenient laboratory method for preparing carbon monoxide is JEE Main level
• Graphite is used as a dry lubricant because JEE Main level
• Select the correct statement(s) about allotropes of carbon. JEE Main level
• Select the correct statement(s) about oxides of carbon. JEE Main level
• Producer gas, made by passing air over red hot coke, is mainly a mixture of JEE Main level
• 10.0 g of CaCO3 is heated strongly (CaCO3 -> CaO + CO2). All the CO2 is passed over excess red hot carbon (CO2 + C -> 2CO) and the CO formed reduces excess Fe2O... JEE Advanced level
• The correct order of C-O bond length is JEE Advanced level
• Consider the statements: (i) diamond is the hardest natural substance and is a poor conductor; (ii) at ordinary temperature and pressure graphite is thermodynam... JEE Advanced level
• Match the reactions of carbon monoxide/dioxide in Column I with products in Column II. Column I: (P) CO + Cl2 (sunlight); (Q) CO + NaOH (heat, pressure); (R) CO... JEE Advanced level
• Nickel tetracarbonyl, Ni(CO)4, formed from CO and nickel, has the following oxidation state of Ni, geometry and magnetic behaviour: JEE Advanced level
• Which of the following reactions occur as written? JEE Advanced level
• 8.96 L (at STP) of a CO and CO2 mixture has an average molar mass of 36 g/mol. It is bubbled through excess lime water. Taking molar volume 22.4 L/mol and C = 1... JEE Advanced level