Electric bulbs are filled with :
1). Nitrogen
2). Carbon dioxide
3). Argon
4). Oxygen
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1. Refrigerators keep food unspoiled because
2. The most abundant constituent of atmospheric air is
3. Question 7.24:Write the conditions to maximize the yield of H2SO4 by Contact process.
4. What is the chemical name for Baking Soda
7. The add used in lead storage cells is
8. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :