Answer: Option (C) is the correct answer.
Explanation:
A reaction in which two or more reactants combine to result in the formation of a single product is known as a synthesis reaction.
For example,
is a synthesis reaction.
Whereas the number of moles of either nitrogen or oxygen is not given. Therefore, we cannot tell which reactant is in excess or not.
Thus, we can conclude that the statement, this is a synthesis reaction is the true statement.
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The melting point (or, rarely, liquefaction point) of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure.
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.