Which fossil fuel is formed from the remains of ancient marine plants and animals under high pressure and temperature? MCQ with Answer and Explanation

Explanation:
H₂O₂ acts as an oxidizing agent, breaking down colored organic compounds into colorless products. It bleaches hair, textiles, and paper. It also acts as a disinfectant. It decomposes to water and oxygen, leaving no harmful residue, making it environmentally friendly.

Explanation:
According to the reactivity series, zinc is more reactive than copper, so Zn displaces Cu: Zn + CuSO₄ → ZnSO₄ + Cu. Silver, gold, and mercury are less reactive than copper and cannot displace it. Reactivity: K > Na > Ca > Mg > Al > Zn > Fe > Pb > Cu > Ag > Au. Displacement reactions are used in metallurgy and galvanic cells. The blue color of CuSO₄ fades as copper is deposited.

Explanation:
Enzymes are proteinaceous substances that act as biological catalysts, speeding up biochemical reactions in living organisms without being consumed. They are highly specific and work under mild conditions (pH, temperature). Examples: amylase breaks down starch, pepsin digests proteins. Inorganic catalysts are like Pt, Ni. Lipids are fats, not catalysts. Negative catalysts (inhibitors) slow reactions. Enzymes may be deactivated by high temperature or extreme pH.