Answer:
Option C.
Explanation:
The arrangement of electrons in their orbital follows certain rules.
The Hund's rule practically explained how electrons are distributed in their orbitals.
The Hund's rule states that electrons distributed among the orbitals of the same shell singly (without partner) before pairing occurs.
In the filling of these electrons in their orbitals, we fill in the electron without pairing first because electrons tends to repel each other before filling with the opposite spin as shown in the attached photo.
Answer:
0.125
Explanation:
im not sure but if you get the grams then divide by the sufficance of xy
Answer: Option (C) is the correct answer.
Explanation:
According to Arrhenius, bases are the species which when dissolved in water will give hydroxide ions, that is, 
.
For example, 
Arrhenius acids are the species which when dissolved in water will give hydrogen ions, that is, 
.
For example, 
In water, when an acid loses a hydrogen ion then the specie formed is known as conjugate base.
Here, 
is the conjugate base of 
.
Similarly, species which accept the hydrogen ion result in the formation of conjugate acid.
Hence, 
is the conjugate acid of 
.
Thus, we can conclude that is the conjugate base.
Answer:
The correct answer is option 4.
Explanation:
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.
This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
For exothermic reaction :ΔH = negative
- If the temperature is increased, so according to the Le-Chatlier's principle , the equilibrium will shift in the direction where decrease in temperature occurs.So, equilibrium will move in backward direction.
- If the temperature is decreased , so according to the Le-Chatlier's principle , the equilibrium will shift in the direction where increase in temperature occurs.So, equilibrium will move in forward direction.
For the given equation:
I) 
,ΔH° = -90 kJ
On Increasing the temperature
This is an exothermic reaction, backward reaction will decrease the temperature. Hence, the equilibrium will shift in the left direction that is towards reactants.
II) 
,ΔH° = -161 kJ
On Increasing the temperature
This is an exothermic reaction, backward reaction will decrease the temperature. Hence, the equilibrium will shift in the left direction that is towards reactants.
Answer: Option (A) is the correct answer.
Explanation:
An atom who has seven valence electrons in its ground state will have the following electronic configuration in its sub shells as 2, 7.
Thus, there will be in total 9 electrons and it is known that fluorine has atomic number 9.
Whereas sodium has 2, 8, 1 electrons in its sub-shell.
Calcium has 2, 8, 8, 2 electrons in its sub-shell and oxygen has 2, 6 electrons in its sub-shell.
Thus, we can conclude that out of the given options, fluorine is the element whose atom in the ground state has seven valence electrons.
