engineering recuitment MP Vyapam Sub Engineer Mock Test 2024 Construction Materials and Management Bricks and Mortar

ईट का लाल रंग किस तत्त्व के कारण होता है?

1
आयरन ऑक्साइड 
2
सिलिका 
3
मैगनिशिया 
4
एलुमिना 
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