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A piece of granulated zinc was dropped into a copper sulphate solution. After some time, the colour of the solution changed from:
  • a)
    light green to blue
  • b)
    blue to colourless
  • c)
    light green to colourless
  • d)
    blue to yellow
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A piece of granulated zinc was dropped into a copper sulphate solution...
We should know that borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate. We should know that borax is the main component of detergents, cosmetics, and enamel glazes. We also use it as a fire retardant and anti-fungal compound in the manufacture of fiberglass, as a flux in metallurgy. We should know that borax is composed of sodium, borax, oxygen and water.
We should know that borax can be found as anhydrous, pentahydrate or dehydrated salt. We should note that the anhydrous and decahydrate forms are the most common forms of borax. The borax decahydrate chemical formula is Na2B4O7.10H2O
Na2B4O7.10H2O
. So, from this we can say that option A is correct.
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Most Upvoted Answer
A piece of granulated zinc was dropped into a copper sulphate solution...
So, here , on adding zinc to CuSO4 solution, zinc displaces copper from copper sulphate & forms zinc sulphate solution. This is indicated by colour change from blue to colourless. CuSO4 solution has a blue colour while ZnSO4 solution is colourless. Zn(s) + CuSO4(aq) -> Cu(s) + ZnSO4 (aq)
Therefore the correct option is = option B
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Community Answer
A piece of granulated zinc was dropped into a copper sulphate solution...
We should know that borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate. We should know that borax is the main component of detergents, cosmetics, and enamel glazes. We also use it as a fire retardant and anti-fungal compound in the manufacture of fiberglass, as a flux in metallurgy. We should know that borax is composed of sodium, borax, oxygen and water.
We should know that borax can be found as anhydrous, pentahydrate or dehydrated salt. We should note that the anhydrous and decahydrate forms are the most common forms of borax. The borax decahydrate chemical formula is Na2B4O7.10H2O
Na2B4O7.10H2O
. So, from this we can say that option A is correct.
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A piece of granulated zinc was dropped into a copper sulphate solution. After some time, the colour of the solution changed from:a)light green to blueb)blue to colourlessc)light green to colourlessd)blue to yellowCorrect answer is option 'B'. Can you explain this answer?
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