railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Periodic Table

પ્રકૃતિમાં સૌથી સખત ધાતુ કઈ છે?

1
લોખંડ
2
પ્લેટિનમ
3
સોનું
4
ટંગસ્ટન
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