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प्रश्न
______ is used for hardening of steel.
विकल्प
Manganese
Copper
Nickel
Chromium
MCQ
रिक्त स्थान भरें
उत्तर
Manganese is used for hardening of steel.
Explanation:
Manganese is used for hardening of steel and also for removing impurities. Steel products need to be galvanised to make them rust-free. This is done by galvanising iron with chromium, nickel and tungsten.
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