Answer:- Chlorine(Cl)
Explanations:- Electron affinity is the amount of energy released when an electron is added to an element in it's gaseous state. Electron affinity increases in a period on going left to right as the size of the element decreases and it's effective nuclear charge increases and this facilitate an element to accept the electron.
The elements mentioned here in the question belongs to the same group and out of these, chlorine is on the right most side and so it is correct choice.
Hence, Chlorine(Cl), because it is a halogen with a high effective nuclear charge is the correct choice.
Answer : The energy released by the decay of 3 grams of 'Th' is 
Explanation :
First we have to calculate the mass defect 
.
The balanced reaction is,
Mass defect = Sum of mass of product - sum of mass of reactants
conversion used : 
Now we have to calculate the energy released.
The energy released is 
Now we have to calculate the energy released by the decay of 3 grams of 'Th'.
As, 230 grams of Th release energy =
So, 3 grams of Th release energy = 
Therefore, the energy released by the decay of 3 grams of 'Th' is
Answer:
100 g of water has the highest number of moles
Explanation:
Recall that the number of moles is obtained as given mass/formula weight
For HCl;
number of moles = 100g/36.5g/mol = 2.7 moles
For H2O;
number of moles = 100g/18g/mol = 5.5 moles
For MgCO3
number of moles = 100g/84.3 g/mol = 1.2 moles
For AlCl3
number of moles = 100g/133.3g/mol = 0.75 moles
For NaCl
number of moles = 100g/58.4 g/mol = 1.7 moles
kcl is the salt koh is the base
Answer:
Catalysts help in increasing rates of reactions
