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Chapter-1 - 11th - Basic Concepts Preparation Multiple Questions and Answers.
| 31. | Molecular mass of water (18 g) means: | ||
| A. | Mole | ||
| B. | Gram mole | ||
| C. | Gram molecule | ||
| D. | All of these | ||
| 32. | Which of the following ion formation is always exothermic: | ||
| A. | Uninegative | ||
| B. | Unipositive | ||
| C. | Dinegative | ||
| D. | Dipositive | ||
| 33. | The number of isotopes of elements with even mass number and even atomic number are: | ||
| A. | 280 | ||
| B. | 300 | ||
| C. | 154 | ||
| D. | 54 | ||
| 34. | Which one of the following is not the mono isotopic element: | ||
| A. | Arsenic | ||
| B. | Uranium | ||
| C. | Iodine | ||
| D. | Gold | ||
| 35. | Percentage of oxygen in calcium carbonate is: | ||
| A. | 40% | ||
| B. | 48% | ||
| C. | 12% | ||
| D. | 16% | ||
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