Chemistry
Grade-10
Easy
Question
Which of the following is the correct order?
- O > Si > Ca > Al
- O > Si > Al > Ca
- Si > O > Ca > Na
- Al > Fe > O > K
Hint:
O>Si>Al>Ca
The correct answer is: O > Si > Al > Ca
Elements of earth's crust in decreasing order of their percentage is:
oxygen 46.1%, Silicon 28.2%, Aluminium 8.23%, Calcium 4.2%.
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