alleryStart learning →Which metal is liquid at room temperature?
- gallium
- sodium
- lead
- mercury
Show answer and solution
Correct answer: D. mercury
Mercury is the only metal that is liquid at room temperature.
Gallium melts at body temperature; sodium and lead are solids.
Indian Navy INET Metals and Non-metals — practice questions
Explore 4 free Metals and Non-metals questions in Indian Navy INET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
Practise Metals and Non-metals with Quill →Metals and Non-metals questions and exercises with answers
Showing questions 1–4 of 4.
Which metal is liquid at room temperature?Read the answer and worked solution →Highly reactive metals like sodium and aluminium are extracted from their ores by:Read the answer and worked solution →Heating a sulfide ore strongly in excess air converts it to an oxide. This step is called:Read the answer and worked solution →Which of the following metals exist in their native state in nature? (i) Cu (ii) Au (iii) Zn (iv) AgRead the answer and worked solution →
Worked practice questions
Highly reactive metals like sodium and aluminium are extracted from their ores by:
- displacement by iron
- electrolysis of molten ore
- heating in air
- reduction with carbon
Show answer and solution
Correct answer: B. electrolysis of molten ore
Carbon is not reactive enough to reduce K, Na, Ca, Mg, Al oxides.
Their molten salts/oxides are electrolysed instead.
Heating a sulfide ore strongly in excess air converts it to an oxide. This step is called:
- calcination
- smelting
- roasting
- electrolysis
Show answer and solution
Correct answer: C. roasting
Roasting = heating in excess air (for sulfides).
Calcination = limited air (for carbonates).
The aim of both is to obtain the oxide for the next reduction step.
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