IGCSE A Level Chemistry Competitive Exam MCQs – Mock Test 51
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MCQ 251: The electronic configuration of chromium is:
MCQ 252: In 1748, the first time the word used in connection with electricity was:
MCQ 253: Law relating to concentrations of substances present at equilibrium and to the stoichiometric equation is known as:
MCQ 254: Halogen with the highest electronegativity is:
MCQ 255: Repulsion in electron pairs occurs until the:
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