The metal used in the manufacture of stainless steel is:
A. Zinc
B. Lead
C. Chromium
D. Copper
Answer: Option C
Solution (By JKExamLibrary)
Stainless steel is an iron alloy containing at least 10.5% chromium, which provides corrosion resistance by forming a passive chromium oxide layer. Nickel and molybdenum may also be added. Copper and zinc are components of brass. Lead is used in batteries and solder. Chromium is essential for 'stainless' property.
Explanation:
Limestone is CaCO₃. On strong heating, it decomposes to calcium oxide (quicklime) and carbon dioxide: CaCO₃ → CaO + CO₂. This is a decomposition reaction used in cement and lime manufacturing. CaO is used in building and as a drying agent.
Explanation:
Natural gas (methane) is often found above petroleum deposits, trapped under cap rock. It burns cleaner than coal and oil, producing less CO₂, no SO₂, and minimal particulates. Coal (including lignite) contains more impurities. Peat is an early stage of coal. Natural gas is transported via pipelines or as LNG.
Explanation:
An alpha particle (α) consists of 2 protons and 2 neutrons, which is the same as a helium-4 nucleus (²⁴He²⁺). It has a +2 charge. Beta particles are electrons (β⁻) or positrons (β⁺). Gamma rays are electromagnetic waves with no mass or charge. Alpha particles have low penetration power and are stopped by a sheet of paper or skin. Rutherford used alpha particles in his scattering experiment.
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