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Chemistry - Periodic Classification Of Elements

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31. Arrange the gases present in air in increasing order of boiling points (NTSE Punjab, Stage-I, 2015-16)

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32. Arrange Li, C, B and Be according to increasing order of their atomic radii (NTSE Punjab, Stage-I, 2015-16)

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33. An element 'X' has the same number of electrons in the first and the fourth shell and in the second and the third shell. What is the formula and nature of its oxide? (NTSE Delhi, Stage-I, 2016-17)

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34. Which of the following is considered to be an anomalous pair of elements in Mendeleev's periodic table based on atomic weights? (NTSE Telangana, Stage-I, 2015-16)

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35. Periodicity in the properties of elements in Modem Periodic Table is due to (NTSE Andhra Pradesh, Stage-I, 2015-16)

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Periodic Classification Of Elements