Question
Iron sheet kept in moist air covered with rust. Rust
isÂSolution
Rust is an iron oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture 4Fe+2Oâ‚‚  +x Hâ‚‚ O → 2Feâ‚‚  O₃ - x H₃ O Hence rust is a compound.Â
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The train must……….reached Delhi by now.
Select the most appropriate option to substitute the underlined segment in the given sentence. If no substitution is required, select No improvement
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