| 1. | An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong ? | |
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Group 3
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Group 2
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Group 1
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Group 4
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Report Question| 2. | The element which has least tendency to lose electron is ? | |
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Ne
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He
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Li
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H
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| 3. | Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br ? | |
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K and F
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K and Br
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Li and Br
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Li and F
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| 4. | In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later ? | |
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Oxygen
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Germanium
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Silicon
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Chlorine
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| 5. | An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A ? | |
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Valency = 3
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Valency = 1
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Valency = 6
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Valency = 2
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| 6. | Chlorine (17) belongs to which group and period ? | |
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16, 3
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1, 3
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7, 3
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17, 3
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| 7. | Which of the following hydroxides is most basic ? | |
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Mg(OH2
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Ca(OH)2
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Ba(OH)2
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Be(OH)2
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| 8. | Which of the following is most reactive ? | |
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I2
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Br2
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F2
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Cl2
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| 9. | Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br ? | |
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K and Br
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Li and Br
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Li and F
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K and F
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| 10. | The family of elements to which potassium belongs is _________ ? | |
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noble gases
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halogens
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alkali metals
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alkaline earth metals
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