A. Sacrificial protection by a more reactive metal
B. Forming an alloy
C. Making iron more reactive
D. Providing a barrier only
Answer: Option A
Solution (By JKSSB Mock Tests)
Zinc coating (galvanizing) provides both barrier and sacrificial protection. Even if scratched, zinc corrodes instead of iron because it is more reactive.
Explanation:
Neutralization is a chemical reaction in which an acid and a base react quantitatively with each other to form a salt and water. For example, HCl + NaOH → NaCl + H₂O. It is generally an exothermic process, and the resulting solution has a pH closer to 7.
Explanation:
The amount of dissolved oxygen is crucial for aquatic life. The Biological Oxygen Demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material. High BOD indicates high organic pollution and low dissolved oxygen levels.
Explanation:
Heavy water (D2O) contains deuterium (an isotope of hydrogen) instead of normal hydrogen. It has a higher molecular mass and absorbs neutrons much less efficiently than ordinary water. Because of this property, it is extensively used as a neutron moderator in certain types of nuclear reactors (like CANDU) to slow down neutrons.
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