Galvanised iron is made by coating iron with
1). Zinc
2). Nickel
3). Chromium
4). Sulphur
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1. The metallic constituents of hard water are :
2. Sodium bicarbonate is commercially known as
3. Which one of the following pairs is NOT correctly matched?
5. Which is not a green house gas ?
6. The element which is commonly used in nuclear for producing electricity by nuclear fission is
8. Which of the following is a renewable source of energy ?
9. Warming ammonium chloride with sodium hydrochloride in a test tube is an example of
10. When there are two electrons in the same orbital they have: