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General Science question with answer

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Question #22,734
General Science English MCQ UP UDA/LDA (Pre) 2001

Q.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

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