Nitric acid is a strong mineral acid with the chemical formula HNO₃. It is also known as aqua fortis. HCl is hydrochloric acid, H₂SO₄ is sulfuric acid, and H₃PO₄ is phosphoric acid. Nitric acid is widely used in fertilizers and explosives.
Explanation:
Boyle's law: PV = constant (at fixed T and n). So P ∝ 1/V. If volume is doubled, pressure halves. Charles' law relates V and T; Graham's law relates diffusion rate to molar mass.
Explanation:
Isobars are atoms of different elements, so they have different atomic numbers (protons). Since mass number is same, number of neutrons also differs. Example: ⁴⁰Ar (Z=18, N=22) and ⁴⁰Ca (Z=20, N=20). Mass number = 40 same. So both atomic number and neutrons differ. Option D is correct as both B and C are true.
Explanation:
Roasting is the process of heating the concentrated ore (usually sulfide ores) strongly in the presence of excess air below its melting point. It converts the ore to its oxide form and removes volatile impurities as gases (e.g., 2ZnS + 3O₂ → 2ZnO + 2SO₂).
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