IGCSE O Level Chemistry MCQs – Mock Test 62
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MCQ 306: First element in periodic table to have 8 valence electrons is:
MCQ 307: Soda water (H2CO3(aq)) has a pH of:
MCQ 308: Consider the equation Al2O3 + NaOH + H2O →NaAl(OH)4. Balancing of the equation requires how many moles of NaOH?
MCQ 309: Chromatography is especially useful for:
MCQ 310: While plotting decrease in mass against time, a flat curve shows:
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