Hydrogen is used instead of Helium to fill balloons for meteorology because
ক) of its low-density
খ) It is almost insoluble in water
গ) It is not very reactive under normal conditions
ঘ) It can be prepared easily
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ক) Reckitt Benckiser
খ) Johnson and Johnson
গ) Kellogg's
ঘ) Sandoz
ক) Maqsudul Alam
খ) Mahbubul Alam
গ) Abed Chowdhury
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ক) Desert
খ) Grassland
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ক) AP = BP
খ) AP > BP
গ) PB > AP
ঘ) AB > AP
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