Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

Why does exposed iron remain protected from rusting for some time even when the zinc coating in galvanisation is scratched?

Answer and explanation

Correct answer: Zinc is more reactive than iron and oxidises first, providing sacrificial protection.

Zinc is more reactive than iron. Even if the coating is scratched, zinc oxidises preferentially and supplies electrons that prevent or slow the oxidation of the exposed iron. This is called sacrificial protection. Option C is incorrect because air and moisture can reach a scratch; the protection mainly results from zinc being more reactive than iron.

Related tags

ScienceClass10Chemical ReactionsGalvanisationRustingSacrificial ProtectionMetals

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.