When Hydrogen starts burning in air it produces ?
1). Ammonia
2). Water
3). Methane
4). (d)(4 ) Carbonic Acid
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1. Which of the following is used to make light weight, but strong plastic ?
2. Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
3. Cement is formed by strongly heating a mixture of
4. Chemical formula for sulphurous acid is:
5. The substance most commonly used as a food preservative is
6. Of the following which one pollutes the air of abig city
7. Most poisonous pollutant in water is
8. Question 16.19:What problem arises in using alitame as artificial sweetener?
9. Which one of the following elements is used in the manufacture of fertilizers
10. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water