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{
"question_id": "c02a04fa295b46ccb3f6dbdcb0323db7",
"filename": "s_101.jpg",
"question_type": "Experimental Operations",
"question": "What operation is being carried out in the round-bottom flask shown?",
"options": [
"Cooling",
"Heating",
"Magnetic stirring",
"At rest"
],
"answer": "C"
},
{
"question_id": "852285120bd242edb24429e48a50c878",
"filename": "s_109.jpg",
"question_type": "Experimental Operations",
"question": "Does the glass beaker (containing a yellow liquid) shown require additional support or clamping?",
"options": [
"Yes—secure it with a clamp or support to prevent tipping or spillage.",
"Place it in a tray with raised edges to contain any leaks.",
"It needs to be clamped on a retort stand and used with heating/stirring equipment.",
"No additional support is needed; it can be used directly on the bench."
],
"answer": "D"
},
{
"question_id": "d9b012f3ae0d456cace839538b140559",
"filename": "s_084.jpg",
"question_type": "Experimental Operations",
"question": "In the top-view image, the glass funnel contains an orange-red mixed phase. Which chemical operation is most likely taking place?",
"options": [
"Let stand (waiting for precipitation or phase separation)",
"Dissolving (solid dissolving in a solvent)",
"Liquid–liquid separation (phase separation)",
"Liquid–liquid extraction (extracting a solute with a solvent)"
],
"answer": "C"
},
{
"question_id": "a755bfe645db452fbc781f5306517f47",
"filename": "s_090.jpg",
"question_type": "Experimental Operations",
"question": "Based on the apparatus shown, which experimental operation is it best suited for?",
"options": [
"Liquid–liquid separation",
"Filtration",
"Extraction",
"Distillation"
],
"answer": "B"
},
{
"question_id": "3e4a79a9499b433096d02e16e217058a",
"filename": "s_128.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the three-neck round-bottom flask in the figure most likely performing?",
"options": [
"Stirring the solution",
"Heating the solution",
"Cooling the solution (low-temperature conditions)",
"Purging the flask with an inert gas"
],
"answer": "C"
},
{
"question_id": "2325b8e78de340d1917ca64da9185326",
"filename": "s_129.jpg",
"question_type": "Experimental Operations",
"question": "Based on the operating situation of the chromatography column shown, the most reasonable next experimental step is:",
"options": [
"Close the stopcock, stop the outflow, and wait for the column to fully stabilize before proceeding",
"Continue to add elution solvent to the column dropwise but do not collect the effluent yet",
"Replace the receiving vessel below with a new test tube before starting to collect the effluent",
"Open the column stopcock to allow the eluted liquid to continue flowing into the test tube below"
],
"answer": "D"
},
{
"question_id": "754562b63ca34be6b7aefeb10cfbbc76",
"filename": "s_137.jpg",
"question_type": "Experimental Operations",
"question": "What experimental operation is being performed with the apparatus and the tilted single-neck round-bottom flask shown?",
"options": [
"Simple distillation/fractional distillation",
"Rotary evaporation (concentrating solvent)",
"Reflux (condensing) reaction",
"Vacuum drying of a solid"
],
"answer": "B"
},
{
"question_id": "bde8db710f4b45478e47a5aac0768e2f",
"filename": "s_082.jpg",
"question_type": "Experimental Operations",
"question": "Is the round-bottom flask in the picture secured by any device other than the green plastic clamp?",
"options": [
"Only held by the green plastic clamp, not connected to other supports",
"Connected and fixed via a ground glass joint to the upper tubing/apparatus",
"Secured to the heating unit by an external support clamp",
"Not clamped; placed directly in the heating bath and supported by its own weight"
],
"answer": "A"
},
{
"question_id": "50e97531604f4cb69b2a109d2825b0bd",
"filename": "s_010.jpg",
"question_type": "Experimental Operations",
"question": "Is the Erlenmeyer flask in the image secured by any other device?",
"options": [
"Secured to the benchtop with tape or rope.",
"Placed directly on the benchtop; no securing devices are visible.",
"Secured on a hotplate or other heating device.",
"Fixed to a stand using laboratory supports and clamps."
],
"answer": "B"
},
{
"question_id": "6ec576ceb4dc4431b9da7908daa6533b",
"filename": "s_261.jpg",
"question_type": "Experimental Operations",
"question": "What operation is the yellow solution in the Erlenmeyer flask undergoing in the image?",
"options": [
"At rest",
"Cooling",
"Stirring",
"Heating"
],
"answer": "C"
},
{
"question_id": "937f9be3dcc44bd185d7ecc62a1e1af5",
"filename": "s_213.jpg",
"question_type": "Experimental Operations",
"question": "Is the test tube at the upper right secured by a device?",
"options": [
"Yes, the test tube is secured in the upper-right test tube rack",
"No, the test tube is suspended on a holder and does not contact the rack",
"No, the test tube is lying on the benchtop without any securing device",
"No, the test tube is clamped to the ring stand"
],
"answer": "A"
},
{
"question_id": "dc86fddf18ed4190a86203a4595344ff",
"filename": "s_269.jpg",
"question_type": "Experimental Operations",
"question": "Is the round-bottom flask in the picture fixed by an additional device?",
"options": [
"Connected and secured to other apparatus using a rubber stopper or tubing",
"Clamped to the support with a clamp",
"Placed directly on the workbench without additional securing",
"Suspended and secured in the air with fine string or wire"
],
"answer": "B"
},
{
"question_id": "d3f40429c5b2447f94a3224f29e13911",
"filename": "s_191.jpg",
"question_type": "Experimental Operations",
"question": "Based on the figure, which of the following is the most reasonable assessment about whether the graduated cylinder needs additional securing?",
"options": [
"Yes — secure the graduated cylinder clamp to the retort stand to ensure it cannot fall",
"Yes — tape the base of the graduated cylinder to the lab bench to prevent slipping",
"Yes — place the graduated cylinder in a tray or container to contain any spills",
"No — the lower part of the graduated cylinder is already held by a plastic clamp and is secure"
],
"answer": "D"
},
{
"question_id": "db79577ec9dd4c0b8aa08cdf970cfbea",
"filename": "s_189.jpg",
"question_type": "Experimental Operations",
"question": "Does the round-bottom flask shown require additional securing in its current state?",
"options": [
"No additional securing is needed; it can be placed directly on a flat surface and remain stable",
"Only fit a rubber ring around the neck so it contacts the support for simple securing",
"It should be placed in a heating mantle or a round-bottom flask clamp for securing",
"It needs to be secured with a clamp and stand to prevent tipping and breakage"
],
"answer": "A"
},
{
"question_id": "0db6b47fd1b44cc19e18cd0f9f016e5c",
"filename": "s_184.jpg",
"question_type": "Experimental Operations",
"question": "Does the beaker containing about 500 mL of pale green solution shown require additional securing?",
"options": [
"It should be covered and secured with a clamp to prevent evaporation or contamination",
"No additional securing is required; it can be placed directly on the lab bench",
"It should be clamped to prevent tipping or spillage",
"It should be placed on a tripod and secured with a clamp"
],
"answer": "B"
},
{
"question_id": "35266f5d12b345739cf036e06e2ce929",
"filename": "s_181.jpg",
"question_type": "Experimental Operations",
"question": "Is the round-bottom flask shown secured with any additional apparatus?",
"options": [
"No — the flask is simply placed on the magnetic stirrer and is not secured",
"Yes — the flask is held by a clamp attached to the magnetic stirrer",
"No — the flask is held stable by friction with the stirrer",
"Yes — the flask is secured by the blue clamp on the retort stand"
],
"answer": "D"
},
{
"question_id": "ff5428b478694bc489f389e1e9c58de2",
"filename": "s_178.jpg",
"question_type": "Experimental Operations",
"question": "What operation is being performed on the liquid in the beaker?",
"options": [
"Stirring the solution",
"Heating the solution",
"Cooling the solution",
"Filtering the solution"
],
"answer": "A"
},
{
"question_id": "d1cadf31ecc44f47add41fb04a0409e8",
"filename": "s_167.jpg",
"question_type": "Experimental Operations",
"question": "Are the three round-bottom flasks in the picture secured by external devices (such as clamps or stands)?",
"options": [
"Yes, all three flasks are secured to a support structure with external clamps or stands",
"Yes, but they are only sealed with white rubber flanged stoppers; no external clamps or stands are visible",
"No, the flasks are only placed on the bench without any securing or sealing devices",
"Cannot determine; the image does not clearly show whether any securing devices are present"
],
"answer": "B"
},
{
"question_id": "a5ff02e6a75f4d1694a05e2cf229bcd2",
"filename": "s_165.jpg",
"question_type": "Experimental Operations",
"question": "When the round-bottom flasks shown are heated in a heating mantle, do they require additional securing devices?",
"options": [
"Yes, but you should switch to flat-bottom flasks and heat them on a hot plate to avoid using clamps",
"No, not necessary; reducing the heating intensity will avoid danger",
"Yes, additional support clamps or stands should be added at the lower body or midsection of the flask to prevent dislodgement",
"No, not necessary; the gray three-prong clamp on the lab stand is sufficient to secure the flasks"
],
"answer": "C"
},
{
"question_id": "ef22a3f8c38f4331ba987c6a08fb7fa3",
"filename": "s_159.jpg",
"question_type": "Experimental Operations",
"question": "Does the Erlenmeyer flask in the picture require additional securing devices in this experimental state?",
"options": [
"Yes, secure it with a clamp or lab stand to prevent tipping",
"Yes, seal and secure it with a rubber stopper or other sealing device",
"Yes, place it on a magnetic stirrer or heating device and secure it",
"No, no additional securing is necessary; it can be placed directly on the workbench"
],
"answer": "D"
}
]
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