Helium gas is used in gas balloons instead of hydrogen gas because it is
1). lighter than hydrogen
2). more abundant than hydrogen
3). noncombustible
4). more stable
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1. The substance that is added to make natural rubber strong and more bouncy is
2. An emulsifier is an agent which
3. Citric acid is present in free form in
4. The common name of sodium bicarbonate is _____.
6. Which of the following metals form an amalgam with other metals ?
7. Molybdenite is an ore/mineral of