In which of the following reactions does reduction takes place
A. Fe2+ + e- → Fe3+ B. 2O2- →O2 + 4e- C. Cr – 2e- → Cr2+ D. 2H+ + 2e- → H2 Correct Answer: Option D – 2H+ + 2e- → H2
Phosphorus is stored under water to prevent it from?
A. Dehydrating B. Becoming inert C. Smelling D. Catching fire Correct Answer: Option D – Catching fire
The chemical used for coagulation in water purification is?
A. Aluminium tetraoxosulphate (VI) B. Copper tetraoxosulphate (VI) C. Sodium tetraoxosulphate (VI) D. Calcium tetraoxosulphate (VI) Correct Answer: Option A – Aluminium tetraoxosulphate (VI)
Environmental pollution is worsened by the release from automobile exhausts of?
A. Water vapour B. Steam C. Smoke D. Heavy metals Correct Answer: Option C – SmokeProducts
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