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Answer the following questions.
1. Explain the process of harvesting
2. When you add water to sulfur dioxide and put a blue litmus paper in it, why does it
turn red?
3. When we put burning candle near the mouth of test tube consisting of sulfuric acid &
pieces of magnesium metal, why does it explode?
4. Why do the colour & solution of copper sulphate change when we take a solution of
copper sulphate in a beaker and put an iron nail in it?
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Answers
Answer:
1 - Harvesting is the process of gathering and mature of the crops . The term " harvesting" in general usage may include immediate postharvast handling , including , cleaning , storing , packing and cleaning .
2 -
=>Harvesting is the process of gathering a ripe crop from the fields. Reaping is the cutting of grain or pulse for harvest, typically using a scythe, sickle, or reaper. ... The term "harvesting" in general usage may include immediate postharvest handling, including cleaning, sorting, packing, and cooling.
=>Sulphur dioxide reacts with water to produce acidic product which turns blue litmus red. SO2 + H20 --> H2SO3. In the reaction, SO2 is sulphur dioxide, H2O is water, H2SO3 is sulfurous acid. The resultant is sulphurous acid.
=>When we put a burning candle near the mouth of the test tube consisting of sulfuric acid and pieces of magnesium metal, it explodes due to the presence of hydrogen gas. Magnesium and sulfuric acid react to give magnesium sulfate and hydrogen gas.
=>When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.