13 A chloride and an oxide of the elements in the third period of the Periodic

13A chloride and an oxide of the elements in the third period of the Periodic Table are dissolvedin two separate portions of water.Both the solutions prepared can be used to dissolve Al2O3but only one can be used todissolve SiO2.Which of the following could be the chloride and the oxide used?APCl5P4OBNaClMgOCSiCl4Na2DMgCl2SO10O3

[AJC/H2/2011 / Q16]From the options given, it means that a chloride of one of the elements was dissolved inwater, and an oxide of the same/different element was also dissolved separately in water.Since both solutions can be used to dissolve Al2O3, it suggests that one of the solutions isalkaline and the other acidic since Al2O3is amphoteric.The one that is used to dissolve SiO2must be alkaline as SiO2is an acidic oxide.

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14The oxide and chloride of an elementLare separately added to water. The two resultingsolutions have the same effect on litmus paper. Which element could L be?

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[ACJC/H1/2011 / Q15]Since both of the resulting solutions have the same effect on litmus, it suggests that bothsolutions are either alkaline, or both solution are acidic.

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Topic 4: The Periodic TablePractice Questions-Worked Solutions© C J C H 1 C h e m i s t r yPage 11Option C (): SiO2gives a neutral solution (insoluble)no change in colour for both blueand red litmus paper and SiCl4an acidic solutionlitmus paper turns redOption D (): P4O10gives H3PO4and PCl5gives H3PO4and HCl, which are both acidicblue litmus paper remains red15Which statements about the oxides and chlorides of the Period 3 elements are correct?1When one mole of PCl5is reacted completely with water, the resulting solution requireseight molar equivalents of NaOH for neutralisation.2A solution of MgCl2is slightly acidic in water.3Both Al2O3and AlCl3react with water to give the colourless complex ion [Al(OH)4]−.[HCI/Prelim 2012/P1/Q33]Option 1(): PCl5hydrolyses completely in water.PCl5+ 4H2OH3PO4+ 5HClH3PO4requires 3 moles of NaOH for complete neutralisation as it is a tribasic acid. 5 molesof HCl would requires 5 moles of NaOH for complete neutralisation.Option 2 (): MgCl2hydrolyses partially in water.

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