The following precautions were listed for the experiment on the determination of the melting point of ice. The incorrect precaution is (1) The bulb of the thermometer should be kept surrounded with crushed ice.
(2) Ice should be stirred regularly to keep a uniform temperature throughout.
(3) The final temperature should be noted by keeping the eyes in line with the level of mercury.
(4) Only the tip of the bulb of the thermometer should just touch the crushed ice.
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From the above given experiment ,the incorrect precaution is identified as option 4) Only the tip of the bulb of the thermometer should just touch the crushed ice.
Explanation:
The temperature of each material is decided by the thermometer bulb. Therefore, to properly measure the temperature, the thermometer bulb must be suitably surrounded by crushed ice.
The correct answer for the given question is option 4.
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