Indian Navy SSR Metals & Non-metals — practice questions

Explore 2 free Metals & Non-metals questions in Indian Navy SSR Science. Open each question or exercise to read its content, reference answers and available explanation.

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Metals & Non-metals questions and exercises with answers

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On prolonged reaction of iron with steam, the oxide formed isRead the answer and worked solution →A non-metal that is lustrous isRead the answer and worked solution →

Worked practice questions

On prolonged reaction of iron with steam, the oxide formed is

Fe(OH)₃
Fe₂O₃
FeO
Fe₃O₄

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Correct answer: D. Fe₃O₄

$3Fe + 4H_2O \xrightarrow{steam} Fe_3O_4 + 4H_2$. Magnetic iron oxide (Fe₃O₄) is produced, not the rust Fe₂O₃ (which needs moist air).

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A non-metal that is lustrous is

sulphur
phosphorus
carbon (amorphous)
iodine

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Correct answer: D. iodine

Iodine is a non-metal but has a shiny, metallic-grey lustre — a notable exception. (Graphite is also lustrous, but iodine is the classic example.)