General Science General Science (GS) Physics Class 9th
Ans → (a)O
Explanation → Oxygen is the most abundant element in the Earth's crust, making up 46.6% of Earth's mass. Silicon is the second most abundant element (27.7%), followed by aluminum (8.1%), iron (5.0%), calcium (3.6%), sodium (2.8%), potassium (2.6%). and magnesium (2.1%)
This question is taken from this post → general science aptitude test | Science MCQ Quiz with Explained Answers - attemp/practice
Directions : (Q.16 - Q.30 Chemistry part)
Q. 16 of Quiz- (Que-ID : 587)