Q: 79 (CDS-I/2005)
question_subject:
Science
question_exam:
CDS-I
stats:
0,31,19,4,7,8,31
keywords:
{'cinnabar': [0, 0, 1, 1], 'copper': [1, 0, 1, 1], 'ore': [2, 1, 3, 1], 'calcium': [2, 0, 0, 4], 'mercury': [0, 0, 2, 2], 'lead': [7, 1, 11, 11]}
The correct answer is option 4: Mercury.
Cinnabar is a red crystalline form of mercury(II) sulfide (HgS). It is the most common source mineral for extracting mercury, making it an important ore of mercury.
Option 1: Calcium is not the correct answer because cinnabar does not contain calcium.
Option 2: Copper is not the correct answer because cinnabar does not contain copper.
Option 3: Lead is not the correct answer because cinnabar does not contain lead.
Therefore, the correct answer is option 4: Mercury, as cinnabar is an ore of mercury and is composed of mercury(II) sulfide.