Actinium-silvery
Boron- black
Calcium-silvery-gray
Berkelium- silvery-white
Chlorine- yellow-green
The balanced skeleton reactions are given below
2CrO₄²⁻(aq) + 3Cu(s) +8(l) → 2Cr(OH)₃(s) + 3Cu(OH)₂(s) + 6(aq)
The oxidising agent and reducing agents are Cr and Cu .
There are following steps involve in balance redox reaction in basic medium .
- First divide the reaction into two half reactions which give oxidation and reduction half reaction.
- Then balance the elements other than oxygen and hydrogen atom.
- Balance the oxygen atom by adding where number of oxygen is less .
- Balance the hydrogen atom by adding on another side of where water molecule added.
- Add ions to both sides to neutralize ion.
- Combine and ion to make .
- Balance the charge by adding .
The species which reduces the other species in the redox reaction is called oxidizing agent . Similarly , the species which oxidize the other species in the redox reaction is called reducing agent .
To learn more about reducing agents please click here ,
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Answer:
a) Platinum > Beryllium > Aluminum > Magnesium > Potassium > Cesium
b) Cesium > Potassium > Magnesium > Aluminum > Beryllium > Platinum
c) Cesium > Potassium
Explanation:
We must recall that the frequency of an electromagnetic wave is directly proportional to its energy. Hence as the work function of the metal increases, the minimum frequency required for emission of electrons occur increases accordingly.
Similarly, the maximum wavelength required for electron emission to occur varies inversely as the work function of the metal hence the answer provided.
Lastly, only caesium and potassium has work function less than the energy of the incident photon hence only these two metals experience electron emission with the kinetic energy of electrons emitted from caesium greater than that emitted from potassium.
Carbon can be used in fuel
The white dwarf has the lowest density of the stars listed. Hope this helps and have a nice day!