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?

Question

Answer

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

Answer

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.

Answer

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.

Answer

Introduction:
Borax, also known as sodium borate, is a compound with the chemical formula Na2B4O7.10H2O. Let's break down the components of this chemical formula to understand why the correct option is B.

Chemical Formula:
- The chemical formula of borax is Na2B4O7.10H2O.
- Na represents sodium, B represents boron, O represents oxygen, and H2O represents water molecules.
- The 10H2O in the formula indicates that there are 10 water molecules associated with each unit of Na2B4O7.

Explanation of Components:
- Na2B4O7 signifies that there are 2 atoms of sodium (Na), 4 atoms of boron (B), and 7 atoms of oxygen (O) in each unit of borax.
- The 10H2O indicates that there are 10 water molecules (H2O) associated with each unit of Na2B4O7. This is why the chemical formula is Na2B4O7.10H2O.

Correct Option:
- The correct option is B, Na2B4O7.10H2O, as it accurately represents the chemical composition of borax with its 10 water molecules per unit.

In conclusion, borax is correctly represented by the chemical formula Na2B4O7.10H2O, indicating the presence of 10 water molecules per unit of sodium borate.

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