Which metal is used in the galvanization of iron? MCQ with Answer and Explanation

Explanation:
Calcium sulfate and magnesium sulfate/chloride cause permanent hardness. Bicarbonates cause temporary hardness removable by boiling.

Explanation:
The magnetic quantum number (m) can only take integer values ranging from -l to +l. For n=3, l can be 2 (a d-orbital). If l=2, the possible values for m are -2, -1, 0, +1, +2. The value m=-3 is outside this range, making this set of quantum numbers impossible.

Explanation:
PVC has polar C-Cl bonds; the chlorine atoms create dipole-dipole interactions between polymer chains, restricting chain movement and making the material rigid and strong. Adding plasticizers (e.g., phthalates) reduces intermolecular forces, making it flexible. Cross-links are in thermosets, PVC is thermoplastic. High molecular weight contributes but polarity is key.