When formaldehyde and potassium hydroxide are heated we get
1). Acetylene
2). Methyl alcohol
3). Methane
4). Ethyl formate
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2. Rusting of iron takes place due to
4. The coloured discharge tubes foradvertisement mainly contain
5. Nitrogen in water is commonly found in the form of
6. Glass is a
7. The function of skimming tank in sewage treatment is to remove
9. Which among the following is present inside the nucleus of an atom?
10. Which of the following elements has the lowest melting point?