Multiple choice

Which of the following statements are true: a. Metals loose their luster gradually when exposed to air and moisture for long time. b. Stone is a transparent material. c. Compressed natural gas is a domestic fuel used in kitchens for cooking purposes.

  1. only b

  2. b and c

  3. a and b

  4. a and c

  5. only a
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. Metals react with air and moisture chemically to form their oxides. When the surface of metals are polished, the oxides fall and metals regain their luster.

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