This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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15. Apart from a Bunsen burner, a heating mantle is another apparatus used for heating in a laboratory. It provides controlled heating, often for flammable liquids or when an open flame is not suitable. The correct option is D. A. A deflagrating spoon is used to hold substances for heating in a flame, not as a heating apparatus itself. B. A dropper pipette is used for transferring small volumes of liquid. C. A spatula is used for scooping solid chemicals. The final answer is D 16. Common causes of accidents in a science laboratory include unsafe behaviors. Running in the laboratory can lead to collisions, spills, and falls, which are common causes of accidents. The correct option is C. A. Wearing safety goggles is a safety precaution, not a cause of an accident. B. Properly labelling chemical containers is a safety precaution, not a cause of an accident. D. Proper use of pipettes is a safe practice, not a cause of an accident. The final answer is C 17. A light microscope is used to magnify tiny substances. A hand lens (magnifying glass) also performs the function of magnifying objects, although typically at a lower magnification than a microscope. The correct option is B. A. A plain mirror reflects light. C. A pooter is used to collect small insects. D. A micrometer screw gauge is used to measure small lengths. The final answer is B