| 1. | Upto which element, the Law of Octaves was found applicable ? | |
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Potassium
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Cobalt
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Calcium
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Oxygen
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Report Question| 2. | 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 = 6
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Valency = 3
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Valency = 2
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Valency = 1
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| 3. | An element has atomic number 17. To which group, period does it belong ? It is metal or non-metal ? | |
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17th group, 3rd period, Metal
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7th group, 3rd period, Metal
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7th group, 2nd period, Non-metal
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17th group, 3rd period, Non-metal
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| 4. | The metal which is hard and has high melting point and used in filaments of electrical bulbs is ? | |
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Pt
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W
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Fe
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Ni
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| 5. | A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide ? | |
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MO2
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M2O3
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M2O
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MO
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| 6. | The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element ? | |
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Aluminium
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Gallium
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Germanium
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Scandium
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| 7. | Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table ? | |
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Group 18
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Group 10
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Group 2
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Group 8
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| 8. | The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds ? | |
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B and C
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A and C
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A and B
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None
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| 9. | An element X combines with oxygen to form an oxide XO. This oxide is electrically con¬ducting. Write the formula of the compound formed when X reacts with chlorine ? | |
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XCl2
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XCl5
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XCl
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XCl3
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| 10. | The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar ? | |
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Na(11)
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F (9)
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P(15)
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N(7)
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