Exams › JEE Advanced › Chemistry

Standard metre scales are manufactured from which alloy because of its very low thermal expansion?

1. invar
2. stainless steel
3. elektron
4. magnalium

Correct answer: invar

Solution

Invar (about 64% Fe, 36% Ni) has an extremely low thermal expansion coefficient, making it ideal for precision length standards.

Related JEE Advanced Chemistry questions

• Sulfide ores are common for the metals -
• When Cu₂S is heated, which of the following substances produces copper metal?
• Galena, a lead ore, undergoes partial oxidation when air is passed through it at elevated temperatures. Afterward, air flow is stopped, and heating continues in a sealed furnace, allowing self-reduction to occur. What is the mass (in kg) of lead formed per kilogram of oxygen used? (Atomic masses in g/mol: O = 16, S = 32, Pb = 207)
• Identify the chemical compositions of calamine, malachite, magnetite, and cryolite in the correct sequence.
• A mixture of cations is treated with H2S gas in an acidic solution. Which group of cations will form insoluble sulfide precipitates under these conditions?
• Which of the following pairs of metals is correctly matched with its commercial extraction method?

⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →