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{
"question_id": "8fd3321094e14983b971b9656e6e03ab",
"filename": "c_016.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the person in the picture performing?",
"options": [
"Pouring reagent directly from a brown light-protective bottle into a round glass bottle placed in a metal pan",
"Using a glass pipette to filter the solution through a conical funnel in a beaker into a container",
"Using a stirring rod to stir and heat the solution on a water bath",
"Using a rubber-bulb dropper to add a colorless, transparent liquid dropwise into the conical flask on the water bath"
],
"answer": "D"
},
{
"question_id": "ba1d4a18f38b49ac8b2ad92c8f91263d",
"filename": "c_025.jpg",
"question_type": "Experimental Operations",
"question": "Looking at the round flask in the picture, how can you tell the liquid is being stirred by a magnetic stirrer?",
"options": [
"The solution is uniformly colored but shows no obvious flow or vortex",
"The liquid surface in the flask forms a distinct vortex",
"The liquid surface in the flask is calm, with no visible rotational movement",
"A large number of bubbles are continuously rising from the liquid in the flask"
],
"answer": "B"
},
{
"question_id": "85105fd7897b4cc9b9d3aadc82e76977",
"filename": "c_036.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the person in the picture performing?",
"options": [
"Discharging brown liquid through a separatory funnel into the 25 mL round-bottom flask below",
"Using a wash bottle to rinse a test tube to remove residual reagents",
"Filtering a solid–liquid mixture through a funnel into a small flask",
"Pouring the brown liquid into the ordinary funnel connected to the top of the pear-shaped separatory funnel"
],
"answer": "D"
},
{
"question_id": "01eb3876204546799ed5d2cac2b07e0b",
"filename": "c_041.jpg",
"question_type": "Experimental Operations",
"question": "What operation is the person in the picture performing?",
"options": [
"Placing the flask on a heating device to heat the reactants",
"Shaking the round-bottom flask to mix the solid powder evenly with the liquid reagent",
"Using a glass rod to stir the mixture in the flask to promote the reaction",
"Slowly adding reagent into the flask dropwise with a blue rubber-bulb dropper"
],
"answer": "B"
},
{
"question_id": "eafe6fbc6d0e4f02a4a2497b3d8684c3",
"filename": "c_049.jpg",
"question_type": "Experimental Operations",
"question": "What operation is the person in the picture performing?",
"options": [
"Adjusting the position of the Erlenmeyer flask below to receive the outflowing liquid",
"Stirring the sample in the small glass vial with a glass rod",
"Securing the separatory funnel on the metal ring of the retort stand",
"Using a rubber-bulb dropper to take liquid from the brown reagent bottle"
],
"answer": "C"
},
{
"question_id": "0d48d1c1b40b4c7e9480a30b6de6b28e",
"filename": "c_053.jpg",
"question_type": "Experimental Operations",
"question": "What operation is the person in the picture performing with the rubber-bulb dropper?",
"options": [
"Adding reagent dropwise into the test tube",
"Mixing solutions in the Erlenmeyer flask with a dropper",
"Transferring the solution with a dropper into a small glass vial for sampling",
"Drawing a small amount of solution from the reagent bottle"
],
"answer": "D"
},
{
"question_id": "30ad5043ddba44c6ae4e4caa68220ebb",
"filename": "c_056.jpg",
"question_type": "Experimental Operations",
"question": "Is the liquid in the round-bottom flask being stirred?",
"options": [
"Yes, the liquid is being stirred by a magnetic stirrer.",
"No, the liquid is stationary with no visible stirring.",
"No, only the stir bar is observed resting on the bottom with no stirring.",
"Cannot determine from the image whether the liquid is being stirred."
],
"answer": "A"
},
{
"question_id": "fc6cef28276b42a9bb4cf77826e22327",
"filename": "c_598.jpg",
"question_type": "Experimental Operations",
"question": "What type of chemical operation is this apparatus most likely used for?",
"options": [
"Distillation separation",
"Recrystallization purification",
"Column chromatography separation",
"Liquid-liquid extraction"
],
"answer": "C"
},
{
"question_id": "e17707f6cc244c808e9fd46d6bf88091",
"filename": "c_074.jpg",
"question_type": "Experimental Operations",
"question": "Based on the image, which action is the person most likely to perform next?",
"options": [
"Stir the blue solution in a 200 mL Erlenmeyer flask with a glass rod.",
"Add yellow liquid to a two-neck flask using a rubber-tipped dropper.",
"Close and put away the large brown reagent bottle marked with red tape.",
"Use a rubber-tipped dropper to add a clear liquid into a 200 mL Erlenmeyer flask containing a deep-blue solution."
],
"answer": "D"
},
{
"question_id": "eec4faf8d3f342d78fbf86c05330b147",
"filename": "c_080.jpg",
"question_type": "Experimental Operations",
"question": "Does the beaker shown in the image require additional support or clamps to secure it?",
"options": [
"No, it can be placed directly.",
"Only a non-slip mat under the base is needed for stability.",
"Use a test-tube rack or tray or similar auxiliary holder to secure it.",
"Requires using a stand or clamp to secure it to prevent tipping."
],
"answer": "A"
},
{
"question_id": "2f01d6335fe3444185e53d259f2fd373",
"filename": "c_082.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the person in the image most likely performing?",
"options": [
"Observing or recording a color change of the liquid in the flask.",
"Securing the round-bottom flask to a retort stand.",
"Adding or removing reagents from the round-bottom flask.",
"Connecting the round-bottom flask to a reflux or condenser apparatus."
],
"answer": "B"
},
{
"question_id": "ceb1fac795004398906bfb16112e1b57",
"filename": "c_085.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the person in the picture most likely performing?",
"options": [
"Assembling apparatus on a ring stand and heating the reaction system",
"Performing an acid–base titration in an Erlenmeyer flask to determine solution concentration",
"Shaking an Erlenmeyer flask containing a dark brown liquid with the right hand to mix it",
"Using a separatory funnel to allow liquid–liquid phase separation and isolate the yellow liquid"
],
"answer": "C"
},
{
"question_id": "4304d797acb0432bb9ecad7af24ba82a",
"filename": "c_086.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the person in the picture more likely performing with a glass rod inside the funnel?",
"options": [
"Stirring inside the funnel with a glass rod to mix the liquids",
"Scraping solid residue inside the funnel with a glass rod",
"Using a glass rod to clear the funnel opening to prevent clogging",
"Using a glass rod inside the funnel to assist liquid flow"
],
"answer": "D"
},
{
"question_id": "5b9f9acab0ec47b3a1ca49d426931620",
"filename": "c_089.jpg",
"question_type": "Experimental Operations",
"question": "Which liquid-addition operation is the person performing with the round-bottom flask in the image?",
"options": [
"Using a Pasteur pipette to add a small amount of reagent to the round-bottom flask",
"Using a pipette to accurately measure and transfer liquid into the round-bottom flask",
"Using a burette to perform titration with a standard solution",
"Using a wash bottle to add solvent or rinse into the round-bottom flask"
],
"answer": "A"
},
{
"question_id": "e0111090aaec4ea6b25cbf0f5a09d0f0",
"filename": "c_090.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the person in the picture performing?",
"options": [
"Heating the round-bottom flask and carrying out reflux",
"Using a Pasteur pipette to add liquid to the round-bottom flask",
"Using a pipette to withdraw liquid from the round-bottom flask",
"Using a burette to titrate the solution in the flask"
],
"answer": "B"
},
{
"question_id": "00130b77f91648a58effb0f712525f18",
"filename": "c_095.jpg",
"question_type": "Experimental Operations",
"question": "Which of the following operations is the person in the picture more likely performing?",
"options": [
"Shaking a separatory funnel to mix two liquid phases",
"Removing the separatory funnel from the ring stand for transfer or weighing",
"Adding reagents to a separatory funnel fixed on the ring stand",
"Releasing the lower yellow phase from the separatory funnel"
],
"answer": "C"
},
{
"question_id": "24cd909e773142dc9f434a8aff005d81",
"filename": "c_096.jpg",
"question_type": "Experimental Operations",
"question": "What operation is the round-bottom flask undergoing in the picture?",
"options": [
"Cooling",
"Shaking",
"Standing",
"Heating"
],
"answer": "D"
},
{
"question_id": "162eb1c0efc4423192d98e49f62219fb",
"filename": "c_100.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the experimenter performing in the picture?",
"options": [
"Pouring a clear liquid into an Erlenmeyer flask using a graduated cylinder",
"Using a graduated cylinder to remove a turbid liquid from a round-bottom flask",
"Slowly adding reagent into an Erlenmeyer flask using a burette",
"Washing and drying the graduated cylinder inside the fume hood"
],
"answer": "A"
},
{
"question_id": "7f45f1b64f1f4b87b09f057f31038d40",
"filename": "c_101.jpg",
"question_type": "Experimental Operations",
"question": "Which operation is the experimenter performing in the picture?",
"options": [
"Using a spatula to transfer a solid sample from an Erlenmeyer flask to a weighing boat",
"Using a spatula to transfer a solid sample from a weighing boat to an Erlenmeyer flask",
"Adding a liquid sample into an Erlenmeyer flask with a dropper",
"Using a graduated cylinder to measure liquid from an Erlenmeyer flask"
],
"answer": "B"
},
{
"question_id": "f52c8a44f6e74574b5b473f1acce4035",
"filename": "c_106.jpg",
"question_type": "Experimental Operations",
"question": "Which of the following operations is the experimenter performing in the picture?",
"options": [
"Using a graduated cylinder to remove liquid from an Erlenmeyer flask",
"Adding the liquid from the separatory funnel dropwise into the Erlenmeyer flask below",
"Pouring liquid into a separatory funnel",
"Adding reagent into a funnel for filtration"
],
"answer": "C"
},
{
"question_id": "bd2362a2349443159e81a04293cf50e8",
"filename": "c_563.jpg",
"question_type": "Experimental Operations",
"question": "Does the 50 mL pear-shaped reaction flask on the right still require additional securing?",
"options": [
"Yes, additional clamps on the body should be added to improve stability",
"No, the existing metal clamp and support stand already securely suspend the flask",
"Yes, replace it with a larger metal clamp to fully tighten around the neck",
"No, using only the yellow plastic joint clip is sufficient to secure it"
],
"answer": "A"
},
{
"question_id": "18f611ddf6ad456ead822d12753af3e3",
"filename": "c_501.jpg",
"question_type": "Experimental Operations",
"question": "Which type of experimental operation is this setup most likely used for?",
"options": [
"Gas collection or scrubbing",
"Vacuum filtration",
"Gravity filtration (at atmospheric pressure)",
"Recrystallization to prepare crystals"
],
"answer": "B"
},
{
"question_id": "578f6e24dcae4a4e82e30d1ee3175e07",
"filename": "c_558.jpg",
"question_type": "Experimental Operations",
"question": "Does the Erlenmeyer flask receiving liquid in the picture need additional securing?",
"options": [
"Only when the flow is rapid or there is a vigorous reaction does the Erlenmeyer flask need to be secured.",
"It should be clamped to a stand with a clamp to prevent tipping.",
"No additional securing is needed; the Erlenmeyer flask can be placed directly at the receiving position.",
"It should be secured to the funnel neck with a rubber stopper or tubing to prevent leaks."
],
"answer": "C"
},
{
"question_id": "35956826050846dfa040168bfb1d475c",
"filename": "c_557.jpg",
"question_type": "Experimental Operations",
"question": "What operation is the reaction flask containing a deep purple/near-black liquid undergoing in the picture?",
"options": [
"Under magnetic stirring",
"Being heated",
"Connected to vacuum or an inert gas supply",
"Standing (not stirred)"
],
"answer": "D"
},
{
"question_id": "110a448636a94efdb03ae780ac3e6f2e",
"filename": "c_549.jpg",
"question_type": "Experimental Operations",
"question": "Does the pear-shaped reaction flask on the left in the picture still require additional securing?",
"options": [
"Yes; a support or clamp should be used to secure the neck or body to prevent tipping.",
"No; the yellow plastic joint clip and pink tape already sufficiently secure it.",
"No; simply wrap the stopper with more tape.",
"Yes, but replacing it with a tighter metal spring clamp at the neck is sufficient."
],
"answer": "A"
},
{
"question_id": "5ee4122cfa084636b90b752aa95e5ac8",
"filename": "c_177.jpg",
"question_type": "Experimental Operations",
"question": "Which experimental operation is the apparatus shown most likely used for?",
"options": [
"Distillation (heating and collecting volatile components)",
"Liquid–liquid separation (using a separatory funnel to transfer layers)",
"Filtration (separating a solid–liquid mixture through filter paper)",
"Titration (quantitatively adding reagent from a burette to the endpoint)"
],
"answer": "B"
},
{
"question_id": "273c1215dae546a0a6b1b39e187ac274",
"filename": "c_539.jpg",
"question_type": "Experimental Operations",
"question": "Does the round-bottom flask in the picture require additional clamping or securing?",
"options": [
"Only the condenser needs to be secured; the flask body does not need to be clamped.",
"Use a flat-bottomed vessel instead, so the flask won't require clamping.",
"Yes; clamp the flask neck and secure it to a stand.",
"No; it is safe to use placed on a tripod with a heat-resistant pad."
],
"answer": "C"
},
{
"question_id": "f6c5107ab5ca4c4eabe5bd565d926403",
"filename": "c_524.jpg",
"question_type": "Experimental Operations",
"question": "What type of chemical operation is the entire setup shown most likely used for?",
"options": [
"Reflux heating for an organic synthesis reaction",
"Vacuum filtration to separate solids from the filtrate",
"Liquid–liquid extraction for solute partitioning and separation",
"Column chromatography to separate components of a mixture"
],
"answer": "D"
},
{
"question_id": "761e31b34d3a4b7c988038d3590f5308",
"filename": "c_532.jpg",
"question_type": "Experimental Operations",
"question": "Does the two-neck round-bottom flask shown require additional clamping or securing?",
"options": [
"Yes; it can be temporarily secured with tape or cord.",
"No; the flask is already secured to the stand by the blue plastic connector.",
"Yes; the neck should be further secured with a clamp.",
"Yes; the bottom should be supported with a tripod or support."
],
"answer": "B"
},
{
"question_id": "1a06e3fcd6714e68b1d739cb27b3ef8f",
"filename": "c_511.jpg",
"question_type": "Experimental Operations",
"question": "Does the three-neck round-bottom flask in the figure require additional clamping or securing?",
"options": [
"Use a three-prong clamp to hold the bottom and secure it to the stand.",
"Tie the flask to the stand with cable ties or rope to prevent movement.",
"No extra clamping is needed; placing it on a magnetic stirrer/hotplate with a cork heating ring provides stability.",
"Clamp one neck with a utility clamp to prevent tipping."
],
"answer": "C"
},
{
"question_id": "7300bbbeb79f4e48886682135a5d002b",
"filename": "c_497.jpg",
"question_type": "Experimental Operations",
"question": "Do these test tubes shown require additional clamping or securing to ensure safety?",
"options": [
"Additional clamps should be attached to all three test tubes.",
"Only the test tube containing the pale yellow liquid needs reinforcement; the others do not.",
"No; the existing test tube rack can stably hold all the test tubes.",
"Only the two test tubes containing black precipitate require additional clamping."
],
"answer": "D"
},
{
"question_id": "54792c58ee64451b85d22df9ffff2d42",
"filename": "c_496.jpg",
"question_type": "Experimental Operations",
"question": "According to the figure, do the test tubes require additional clamping or securing devices?",
"options": [
"Yes; test tubes containing solids or precipitate should be additionally clamped to prevent tipping or spillage.",
"No; all test tubes are in a rack and are stable enough without extra fastening.",
"Additional clamping is only required during heating or shaking operations; it is unnecessary when stationary.",
"Only individual test tubes with visible precipitate or solids need to be secured; the others can remain in the rack."
],
"answer": "A"
},
{
"question_id": "67549e8600664b919001317b6de46d58",
"filename": "c_484.jpg",
"question_type": "Experimental Operations",
"question": "Does the graduated cylinder shown require additional fixtures for securing?",
"options": [
"It should be secured with a clamp or a three-prong clamp.",
"No; the graduated cylinder is already placed on a stable support.",
"Only during special operations such as heating or shaking does it need additional securing.",
"Only needs temporary securing when pouring or transferring liquids."
],
"answer": "B"
},
{
"question_id": "fcf2cc912f964a9896a4799a924fbea8",
"filename": "c_483.jpg",
"question_type": "Experimental Operations",
"question": "Does the conical flask on the left in the figure require additional clamping or securing?",
"options": [
"Yes; secure the neck with a rubber stopper or sealing cap.",
"Yes; fasten the flask to the stand with a metal clamp and support rod.",
"No; the conical flask on the left can be placed directly for use.",
"Yes; reinforce it against tipping with a clamping holder or universal clamp."
],
"answer": "C"
},
{
"question_id": "45e1b593a3204cbd9b7a3629d6aac1c7",
"filename": "c_477.jpg",
"question_type": "Experimental Operations",
"question": "Do the two two-neck round-bottom flasks placed on cork rings in the figure require additional clamping or securing?",
"options": [
"No; resting on cork rings is sufficiently stable.",
"Only necessary during prolonged heating or when connected to tubing; for short procedures it need not be secured.",
"Use a sealing sleeve or tape to secure the flask neck rather than clamping the body.",
"Yes; clamp them to a stand to prevent tipping and slipping during heating."
],
"answer": "D"
},
{
"question_id": "00786803116a4473bd65347137dabb11",
"filename": "c_476.jpg",
"question_type": "Experimental Operations",
"question": "Does the frontmost round-bottom flask (on the white magnetic stirrer) require additional clamping or securing?",
"options": [
"Yes; it should be further secured with a clamp or support stand.",
"Yes; but placing a non-slip pad under the base is sufficient to prevent tipping.",
"No; placing it on the magnetic stirrer provides sufficient stability.",
"No; because all the flasks in the figure are already secured to stands."
],
"answer": "A"
},
{
"question_id": "e06e32ad823d4115ad58bd68cf4a6e1c",
"filename": "c_470.jpg",
"question_type": "Experimental Operations",
"question": "Do the test tubes in the figure require additional devices for clamping or securing?",
"options": [
"Yes; but they can be hand-held or temporarily supported instead of using permanent clamps.",
"Yes; use a test-tube clamp to secure the tubes to the stand.",
"No; they can be placed upright directly on the bench or a tray.",
"No; placing them in a test-tube rack is sufficient—no clamps required."
],
"answer": "B"
},
{
"question_id": "97e2a991c7ce46718a41b1a059f89c77",
"filename": "c_446.jpg",
"question_type": "Experimental Operations",
"question": "Is the glass funnel on the left in the figure secured to the stand by an additional device (such as a clamp)?",
"options": [
"No; the funnel is simply placed on the bench or a vessel and not clamped.",
"Yes; but it is secured by simple means such as a rubber ring or stopper rather than a metal clamp.",
"No; the funnel is inserted into or rests on the column and is supported by it.",
"Yes; secured to the stand with a clamp."
],
"answer": "D"
},
{
"question_id": "c7bff2b86ab1409eaa1ea0bfbe55997d",
"filename": "c_386.jpg",
"question_type": "Experimental Operations",
"question": "Is the pear-shaped flask in the picture clamped or otherwise secured by an additional device?",
"options": [
"No — no clamping or securing; placed directly.",
"No — held by hand or temporary support; no fixed device used.",
"Yes — clamped to a ring stand and fixed on the hot plate.",
"Yes — only supported by a black flask cradle, not clamped."
],
"answer": "C"
},
{
"question_id": "a5cdd8fade054726abd533ad02d8a18e",
"filename": "c_347.jpg",
"question_type": "Experimental Operations",
"question": "Is the pear-shaped separatory funnel in the image secured by an additional device? If so, which method best matches what is shown?",
"options": [
"Fixed using a magnetic base.",
"Clamped to the stand with a clamp on a ring stand.",
"Not externally secured; only placed on the bench.",
"Temporarily tied and secured with rope or rubber bands."
],
"answer": "B"
}
]
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