63ʳᵈ B.P.S.C. (Pre) 2017

The gas, which comes out on opening a soda water bottle, is :

aCarbon dioxide✓ Correct
bHydrogen
cNitrogen
dSulphur dioxide
eNone of the above/More than one of the above

Explanation

The gas released on opening a soda water bottle is carbon dioxide (CO₂), which remains dissolved in the soda under high pressure. ## Page 40 ## Layout Attribution (Critical) A table of layout regions detected on this page is provided inside <layout_regions> tags. Each region has an id, a label (e.g. text, table, image, header, footer, chart, etc.), and a bounding box in box_2d format [y_min, x_min, y_max, x_max] normalized to 0..1000 with top-left origin. Your task: before EVERY markdown element you output (paragraph, heading, table, list, code block, mermaid block, image placeholder, equation, page_header, page_footer, etc.), insert an HTML comment listing the layout region id(s) that correspond to that element: Rules: - Every markdown element MUST be preceded by a comment. - A single element may map to multiple layout regions (e.g. a table spanning two detected regions). List all matching ids separated by spaces. - A layout region should appear in at most one comment. - Use the bounding box and label to match visual regions on the screenshot to the content you are transcribing. - If a visible region has no matching layout id, you can omit the attribution comment for that element. - The layout region table is a reference for attribution only — the OCR text content is provided separately. Tables: - Output tables in HTML when possible. - Table should not be use for page formatting (column or grid like layout), but only for tabular data. - Some table may be irregular, with…

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