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Chemistry Periodic Classification Of Elements Difficulty: Medium

In a periodic table, while moving from left to right in a period, number of remains same.

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The basic chemical building block of natural rubber obtained from trees is Air pollution is caused by smoke. Which of the following types of coal produces no smoke on burning? During which process empty spaces between particles become minimum ? Match List-I with List-II and select the correct answer: List-I (Organic Acid) List-II (Natural Source) a. Formic acid 1. In milk b. Lactic acid 2. In red ants c. Tartaric acid 3. In tamarind d. Glumatic acid 4. In wheat Which of the following terms is not used for ionic compound ?