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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Hydrogen is used instead of Helium to fill balloons for meteorology because

A. of its low-density
B. It is almost insoluble in water
C. It is not very reactive under normal conditions
D. It can be prepared easily
সঠিক উত্তরঃ A. of its low-density
Explanation: