Hydrogen peroxide decomposes slowly on exposure to light. To prevent this, it is stored in:
A. Dark colored bottles
B. Metal containers
C. Open beakers
D. Clear glass bottles
Answer: Option A
Solution (By JKSSB Mock Tests)
Light catalyzes decomposition of H₂O₂. Dark bottles (amber) block light, stabilizing it. Often a stabilizer like urea or phosphoric acid is added. Metal containers may catalyze decomposition.
Explanation:
Two or more substances combine to form a single product: N₂ + 3H₂ → 2NH₃. This is a combination (synthesis) reaction. Decomposition involves a single compound breaking down. Displacement: one element displaces another. Double displacement: exchange of ions. The Haber process for ammonia is also a redox and reversible reaction. Combination can be exothermic.
Explanation:
KBr is ionic; potassium (metal) transfers one electron to bromine (non-metal) forming K⁺ and Br⁻. CO₂ and H₂O are covalent (sharing). Cl₂ is covalent (nonpolar).
Explanation:
Incomplete combustion due to insufficient oxygen produces carbon monoxide (CO) and/or soot (C). Complete combustion gives CO₂ and H₂O. CO is poisonous, binds to hemoglobin.
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