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Chemistry - Periodic Classification Of Elements

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21. An element X combines with hydrogen to form a compound XH3. The element X is placed on the right side of the periodic table. What is true about the element X?
A. Has 3 valence electrons.
B. Is a metal and is solid.
C. Is a non-metal and is a gas.
D. Has 5 valence electrons.
E. XH3 reacts with water to form a basic compound. (NTSE Stage-II,2012-13)

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22. The bond, in compound formed from combination of 14 group and 17 group elements of Periodic table will be (NTSEW Madhya Pradesh, Stage-I, 2014-15)

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23. In Haber process of Ammonia production, the element used as catalytic promoter to increase the activity of Iron catalyst is (NTSE Madhya Pradesh, Stage-I, 2014-15)

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24. First and second ionisation energies of magnesium are 7.646 eV and 15.035 eV respectively. The amount of energy in kJ needed to convert all the atoms of magnesium into Mg2+ ions present in  12 x 10-3 g of magnesium vapour is [1 eV atom-1 = 96.5 kJmol-1] (NTSE Andhra Pradesh, Stage-I, 2014-15)

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25. The 'd' block elements in the Periodic Table form alloys among themselves because (NTSE Odisha, Stage-I, 2014-15)

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Periodic Classification Of Elements