Which of the following elements is non radioactive ?
1). Uranium
2). Thorium
3). Plutonium
4). Zirconium
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1. Which of the following is ozone depleting pesticide ?
2. Oxygen has (+) oxidation number only in
3. Carborundum is another name of
4. The chemical that is used to ripen mangoes is
5. Diamond is harder than graphite because of
6. Ultraviolet radiation striking this earth is due to the depletion of
8. Which of the following produces highest amount of energy upon oxidation?