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| 1. How many protons are there in a lithium(I) ion? |
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| 2. How many moles of oxygen atoms are there in 96g of ozone gas (O3)?(O--16) |
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| 3. How many moles of electrons are there in 4g of hydrogen gas? (H--1) |
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| 4. What is the atomic number of Be? |
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| 5. What is the mass number of 2H? |
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| 6. What is the relative isotopic mass of 4He? |
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| 7. What is the basicity of sulphuric acid? |
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| 8. What is the atomicity of P4 molecule? |
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| 9. 50 cm3 of 2M sulphuric acid required 100 cm3 of sodium hydroxide solution for complete neutralization. What was the molarity of the sodium hydroxide solution? |
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| 10. What is the number of grams of sodium hydroxide in 250 cm3 of 0.4M NaOH solution? (H--1, N--14, O--16, Na--23) |
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| 11. A gaseous element has a relative atomic mass of 16. 1dm3 of the gas at room temperature and 1 atmospheric pressure has a mass of 2g. How many atoms are present in a molecule of the element? |
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| 12. 0.5 mole of calcium chloride and 1.0 mole of sodium chloride were dissolved in water and made up to 500cm3. What was the molarity of chloride ion? |
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| 13. 0.5 dm3 4M HCl is mixed with 0.5 dm3 4M NaOH. What is the molarity of the resulting NaCl solution? |
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| 14. How many moles of CO2 can be obtained from 4 moles of sodium hydrogencarbonate and excess dilute HCl(aq)? |
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| 15. How many moles of CO2 can be obtained from the thermal decomposition of 4 moles of sodium hydrogencarbonate? |
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| 16. What is the number of outermost electrons in silicon? |
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| 17. Which period in the Periodic Table does copper belong to? |
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| 18. Which period in the Periodic Table does bromine belong to? |
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| 19. Which group in the Periodic Table does phosphorus belong to? |
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| 20. Which group in the Periodic Table does boron belong to? |
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| 21. How many isomers are there in a compound with molecular formula C4H10? |
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| 22. How many isomers are there in a compound with molecular formula C2H4Cl2? |
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| 23. How many isomers are there in a compound with molecular formula C4H9Br? |
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| 24. How many isomers are there in a compound with molecular formula C3H6Cl2? |
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| 25. How many isomers with hydroxyl (OH) functional group are there in a compound with molecular formula C4H9OH? |
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| 26. What is the oxidation number of phosphorus in H3PO4? |
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| 27. What is the oxidation number of nitrogen in HNO2? |
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| 28. What is the oxidation number of sulphur in SO42- ? |
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| 29. What is the oxidation number of chlorine in ClO3-? |
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| 30. What is the oxidation number of chromium in dichromate ion? |
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| 31. How many protons are there in an atom of boron? |
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| 32. How many protons are there in an ion of He2+ ? |
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| 33. How many neutrons are there in an atom of 3H? |
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| 34. How many lone pair of electrons are there in the sulphur atom of a hydrogen sulphide molecule? |
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| 35. How many bond pair of electrons are there in the phosphorus atom of a phosphine (PH3) molecule? |
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| 36. How many dm3 of O2 at room temperature and 1 atmospheric pressure, are needed to react completely with 10g of Ca? (Molar volume at room temperature and 1 atmospheric pressure = 24 dm3)(Ca-- 40) |
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