Chemistry
Grade-8
Easy
Question
In which of the following forms does carbon occur in the Earth’s crust?
- Free
- Combined
- Both (a) and (b)
- Cannot predict
Hint:
Carbon occur in the earth's crust in both free and combined state.
The correct answer is: Both (a) and (b)
Carbon makes up only about 0.025 percent of Earth's crust. Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a radionuclide, decaying with a half-life of about 5,730 years. Carbon is one of the few elements known since antiquity.
Carbon occur in the earth's crust in both free and combined state.
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3. A thistle funnel is inserted through one hole, and another hole, a delivery tube, is introduced.
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