Question
What are quantum numbers? Discuss this in detail.

Answer

SELF

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  2. Assign reason for the following:
  1. A solution of $NH_4Cl$ in water shows pH less than 7.
  2. In qualitative analysis $NH_4Cl$ is added before adding $NH_4OH$ for testing $Fe^{3+}$ or $AP^{3+}$ ions.
  1. Consider the reaction:
$\text{N}_2(\text{g})+3\text{H}_2(\text{g})\rightleftharpoons2\text{NH}_3+\text{Heat}$
Indicate the direction in which the equilibrium will shift when:
  1. Temperature is increased.
  2. Pressure is increased.
Reaction between $N _2$ and $O _2$ - takes place as follows:
$
2 N_2(g)+O_3(g) \rightleftharpoons 2 N_2 O(g)
$
If a mixture of 0.482 mol of $N _2$ and 0.933 mol of $O _2$ is placed in a 10 L reaction vessel and allowed to form $N _2 O$ at a temperature for which $K_c=2.0 \times 10^{-37}$ determines the composition of the equilibrium mixture.
Consider the cell reaction of an electrochemical cell:
$\text{Ni}\text{(s)}+2\text{Ag}^+\text{(aq)}\xrightarrow{\ \\ \ \ \ \ }\text{Ni}^{2+}\text{(aq)}+2\text{Ag}\text{(s)}$
Answer the following questions:
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  2. Mention the direction of flow of electrons.
  3. How is the electroneutrality maintained in solution of two half cells?
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How do you count for the following observations?
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$\mathrm{K}_p=0.04 \mathrm{~atm}$ at 899 K for the equilibrium shown below. What is the equilibrium concentration of $\mathrm{C}_2 \mathrm{H}_6$ when it is placed in a flask at 4.0atm pressure and allowed to come to equilibrium?
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Explain the significance of sodium, potassium, magnesium and calcium in biological fluids.
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