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Chapter-1 - 11th - Basic Concepts Preparation Multiple Questions and Answers.
| 26. | Atoms of all the elements always contain in nucleus: | ||
| A. | Proton | ||
| B. | Proton and neutron | ||
| C. | Neutron | ||
| D. | Electron and neutron | ||
| 27. | Actual yield of a chemical reaction is always less than theoretical yield because: | ||
| A. | Side reactions | ||
| B. | Wastage of products | ||
| C. | Reversible reactions | ||
| D. | All of these | ||
| 28. | Mass of sodium in 53 g of Na2CO3 is: | ||
| A. | 23 g | ||
| B. | 46 g | ||
| C. | 92 g | ||
| D. | 106 g | ||
| 29. | 20 moles each of Mg and O2 react to form MgO. The amount of MgO formed would be: | ||
| A. | 20 g | ||
| B. | 400 g | ||
| C. | 800 g | ||
| D. | 1600 g | ||
| 30. | The number of peaks obtained in mass spectrometry shows: | ||
| A. | Charge on isotope | ||
| B. | Mass of isotope | ||
| C. | Number of isotopes | ||
| D. | Relative abundance of isotopes | ||
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