In the reaction CuO + H₂ → Cu + H₂O, which substance is reduced? MCQ with Answer and Explanation

Explanation:
Borosilicate glass (e.g., Pyrex) contains boron trioxide (B₂O₃) along with silica, giving it low coefficient of thermal expansion, thus resistant to cracking under temperature changes. Soda-lime glass is ordinary glass, used for bottles, windows. Lead crystal has high refractive index for decorative items. Quartz glass (pure SiO₂) has very high melting point but is expensive. Borosilicate is ideal for beakers, test tubes.

Explanation:
Lower activation energy means more molecules have energy to cross the barrier, increasing the reaction rate. Enthalpy (ΔH) and equilibrium constant remain unchanged. Catalyst does not affect stoichiometry.

Explanation:
Contact process: SO₂ + O₂ ⇌ SO₃ (catalyst V₂O₅) followed by absorption in H₂SO₄ to produce H₂S₂O₇, then H₂SO₄.