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Chemistry Chemistry Difficulty: Medium

Which of the following is a metallic ore ?

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Consider the following statements. 1. Pyrex glasses have boron oxide as main constituent besides silica. 2. Pyrex glasses have high thermal expansion, thus less vulnerable to cracking from thermal shock. 3. They are commonly used for reagent bottles, optical component and household cookware. Which of the statement(s) given above is/are correct? Elements in the same group is Similar in Gas produced with the reaction of the soda with hydrochloric acid. In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________? Which of the following molecules has a bond order of 2.5?