General Chemistry Previously Asked Questions: Hydrogen and its Compounds — Flashcards | General Studies For Competitive Examinations | FatSkills

General Chemistry Previously Asked Questions: Hydrogen and its Compounds — Flashcards

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Consider the following statements and select the correct answer from given codes below.
1. Water becomes harder due to the presence of Calcium Sulphate and it is not usable.
2. Diamond is harder than copper and iron.
3. Oxygen is the main component of air.
4. Nitrogen is used in the manufacture of vegetable ghee. Code
1 and 2
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