Punjab Chemistry Online Test 12th Class Chapter 1 Periodic Classification of Elements and Periodicity

Test For: All Punjab Boards 12th Class Students
The Punjab Board of Intermediate and Secondary Education BISE PUNJAB BOARD Chemistry Online Test for the 12th Class Model Paper Chapter No 01 has been provided for the Preparations. You should attempt this online Text Book, Model Papers and get higher marks and Grades because it is very helpful for you.
Test Helpful For: Students of Punjab All Boards like Lahore, Gujranwala, Faisalabad, Sargodha, Rawalpindi, Multan, DG Khan, Bahawalpur and Sahiwal Intermediate (12th Class) for Preparation of their Annual Exams for Higher Grades. So you must Preparation here online.

Punjab Chemistry Online Test 12th Class Chapter 1 Periodic Classification of Elements and Periodicity

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  1. Which of the following is amphoteric oxide ?
    Answer: Although aluminum oxide is metal but Al2O3 is amphoteric oxide. Because Na2O & MgO is basic becuase metallic oxides show basic nature And SO2 is non-metal and non-metallic oxides show acidic nature so it is acidic.
    Note: the trend in period 3 is grom strongly basic oxide on the left-hand side to strongly acidic ones on the right hand side, via an amphoteric oxide (aluminium oxide) in the middle .
    •An amphoteric oxide is one which show both acidic and basic properties or character.
    how lead monoxide is amphoteric ?
    Pb is non-metal and its oxide will be called non-metallic oxide. And non-metallic oxide are always acidic in nature but since it is in Group 4 so in this group every element has its own properties. There is irregularity in all of their trends. the monoxides of G-IVA are amphoteric including germanium, Tin & Lead.
    Thank me later 😉

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