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Chemistry - Periodic Classification Of Elements

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36. X, Y and Z are the three elements, each one belongs to anyone of the groups lA, lilA and VA. The oxide of X is amphoteric, the oxide of Y is highly acidic, and the oxide of Z is highly basic. Identify the groups to which these elements X, Y, Z belong to (NTSE Andhra Pradesh, Stage-I, 2015-16) X Y Z

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37. Which one of the following is the smallest in size? (NTSE Andhra Pradesh, Stage-I, 2016-17)

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38. The total number of elements present in 4th period of Modern Periodic Table is (NTSE Maharashtra, Stage-I, 2015-16)

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39. An element, X has electronic configuration 2, 8, 4. Which of the following is not appropriate for X? (NTSE bOdisha, Stage-I, 2016-17)

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40. Which of the following does not form salt either with acid or with alkali? (NTSE Odisha, Stage-I, 2016-17)

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Periodic Classification Of Elements