Question : Which of the following is used to chemically test starch?
Option 1: Chlorine solution
Option 2: lodine solution
Option 3: Sulphur solution
Option 4: Bromine solution
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Correct Answer: lodine solution
Solution : The correct option is the Iodine solution.
Using a chemical reaction, the iodine-starch test may determine if starch or iodine is present. Iodine creates a blue-black complex when it interacts with starch. The test is performed by dabbing a sample with a few drops of iodine solution; if the sample contains starch, it becomes blue-black. In biology and chemistry, the iodine-starch test is commonly used to detect starch in a wide range of materials, including food, plants, and laboratory solutions.
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Question : Which of the following gases is most toxic ?
Option 1: Carbon dioxide
Option 2: Carbon monoxide
Option 3: Sulphur dioxide
Option 4: Chlorine
Question : ______ gas is used for the manufacturing of bleaching powder.
Option 1: Nitrogen
Option 2: Sulphur
Option 3: Oxygen
Question : Which one of the following non-metals shows allotropy in the liquid state?
Option 1: Carbon
Option 3: Phosphorus
Option 4: Bromine
Question : The characteristic odour of garlic is due to _______.
Option 1: iodine
Option 2: copper
Option 3: chlorine
Option 4: sulphur
Question : The amount of chlorine available in water after disinfection is called as
Option 1: Free chlorine
Option 2: Residual chlorine
Option 3: Free available chlorine
Option 4: Combined available chlorine
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