Question
- What is the main difference between electro magnetic waves theory and Planck's quantum theory.
- Which rule is violated in the following orbital diagram:
✓
Answer
- Electromagnetic Waves Theory: Energy is radiated or absorbed continuously.
- Hund's rule is being violated: Because orbitals having equal energy should be singly filled first and then pairing of electron should take place.
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100mL of a liquid is contained in awn insulated container at a pressure of 1bar. The pressure is steeply increased to 100bar. The volume of the liquid is decreased by 1mL at this constant pressure. Find $\Delta\text{H}$ and $\Delta\text{U}.$
→For the reaction : $\text{N}_2\text{(g)}+\text{3H}_2\text{(g)}\rightleftharpoons\text{2NH}_3\text{(g)}$ Equilibrium constant $\text{K}_\text{c}=\frac{[\text{NH}_3]^2}{[\text{N}_2][\text{H}_2]^3}$ Some reactions are written below in Column I and their equilibrium constants in terms of $\text{K}_\text{c}$ are written in Column II. Match the following reactions with the corresponding equilibrium constant.
→| Column I (Reaction) | Column II (Equilibrium constant) | ||
| i. | $2\text{N}_2\text{(g)}+\text{6H}_2\text{(g)}\rightleftharpoons\text{4NH}_3\text{(g)}$ | a. | $2\text{K}_\text{c}$ |
| ii. | $2\text{NH}_3\text{(g)}\rightleftharpoons\text{N}_2\text{(g)}+\text{3H}_2\text{(g)}$ | b. | $\text{K}_\text{c}^\frac{1}{2}$ |
| iii. | $\frac{1}{2}\text{N}_2\text{(g)}+\frac{3}{2}\text{H}_2\text{(g)}\rightleftharpoons\text{NH}_3\text{(g)}$ | c. | $\frac{1}{\text{K}_\text{c}}$ |
| d. | $\text{K}_\text{c}^2$ | ||
- Which orbital is non-directional?
- What are the frequency and wavelength of a photon emitted during a transition from n = 5 state to n = 2 state in the hydrogen atom?
Among the elements of second period Li to Ne, pick out element:
- With the highest first ionisation energy.
- With highest electronegativity.
- With largest atomic radius.
- That is most reactive non-metal.
- That is most reactive metal.
- With valency equal to 4.
QUESTION Use the following data to calculate $\Delta_{\text {lattice }} H ^{\ominus}$ for $NaBr \Delta_{\text {sub }} H ^{\ominus}$ for sodium metal $=108.4 kJ mol ^{-1}$ Ionization enthalpy of sodium $=496 kJ mol ^{-1}$ Electron gain enthalpy of bromine $=-325 kJ mol ^{-1}$ Bond dissociation enthalpy of bromine $=192 kJ$ $mol ^{-1} \Delta_{ f } H ^{\ominus}$ for $NaBr ( s )=-360.1 kJ mol ^{-1}$
→How can domestic waste be used as manure?
Ozone is a gas heavier than air. Why does ozone layer not settle down near the earth?
How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionization enthalpy of H atom (energy required to remove the electron from n = 1 orbit).
Urine has a pH of 6.0. If a patient eliminates 1300mL of urine per day, how many gram equivalents of the acid he eliminates per day?
Equilibrium constant, $K_c$ for the reaction
$\text{N}_2\text{ (g) + 3H}_2\text{ (g)}\rightleftharpoons2\text{NH}_3\text{ (g) at 500k is 0.061}$
At a particular time, the analysis shows that composition of the reaction mixture is $3.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~N}_2, 2.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{H}_2$ and $0.5 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{NH}_3$. Is the reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium?
→$\text{N}_2\text{ (g) + 3H}_2\text{ (g)}\rightleftharpoons2\text{NH}_3\text{ (g) at 500k is 0.061}$
At a particular time, the analysis shows that composition of the reaction mixture is $3.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~N}_2, 2.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{H}_2$ and $0.5 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{NH}_3$. Is the reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium?