DG. Khan Board 2019 chemistry past paper
Q.1: Answer all the following Multiple Choice Questions: The pressure of vapours maintained in the ionization chamber of a mass spectrometer during isotopic analysis is: (a) High (b) Low (c) Moderate (d) Zero Volume occupied by one mole of gas at standard temperature and pressure is: (a) 22.414 dm³ (b) 22.4 L (c) 1 L […]
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