Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Chemistry Some Basic Concepts of Chemistry Mole Concept

40% (w/v) NaCl এর আপেক্ষিক ঘনত্ব 1.12 g/mL। NaCl এর ঘনত্ব ppm এ কত?

1
5.5 x 105
2
3.57 x 105​
3
1 x 106
4
4 x 105​
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