1. What is the chemical formula of Plaster of Paris? (NTSE Mizoram, Stage-I, 2012-13)

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3. The pH of solution formed by mixing 40 ml of 0.10 M HCI and 10 ml of 0.45 M of NaOH is (NTSE Panchkula, Chandigarh, Stage-I, 2012-13)

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4. Match the following. i. Vinegar P. Tartaric acid ii. Orange Q. Oxalic acid iii. Tamarind R. Acetic acid iv. Tomato S. Citric acid (NTSE Panchkula, Chandigarh, Stage-I, 2012-13)

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5. If the pH of a solution is 8, its [H+] is (NTSE Andhra Pradesh, Stage-I, 2012-13)

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