In the case of the correct answer D, it was assumed that \(P\) and \(T\) are constant and hence as D is the best answer of those given it was decided to keep this question, as 40% of candidates gave D as the correct answer. Some respondents did comment that the law is only valid if \(P\) and \(T\) are constant, which is a fair comment and it would have been better if for each of the answers A-D that the variables for the other constants had been put in brackets. One respondent stated that general chemical nomenclature of ionic species is not explicitly on the syllabus and that a compound such as \(n = \) constant, was given by 40% of candidates and hence it was felt that the question although tough could be answered with a clear understanding of the nature of Avogadro’s law as cited in AS 1.4.4. Groundwater alteration of tinge: white precipitate with calcium carbonate barium chloride: distinguished by density and hardness Anhydrite 2.90 to 3 3 to 3.5 Covered in separate section Kyanite 3.53 to 3.65 5.5 to 7 White-pure blue: vitreous or Detrital from pearly lustre: bladed crystals metamorphosed or columnar masses sandstones Cutting.
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