Question
Explain IUPAC system of nomenclature of elements with example.

Answer

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In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of 3.15 × 10–18J from the radiations of 600nm, calculate the number of photons received by the detector.
  1. Write the conjugate acid of NH3.
  2. Assign reason for the following:
  1. A solution of NH4Cl in water shows pH less than 7.
  2. In qualitative analysis NH4Cl is added before adding NH4OH for testing Fe3+ or AP3+ 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.
Attempt any five of the following:
1. Can a catalyst change the position of equilibrium in a reaction?
2. To which category of compounds does cyclohexane belong?
3.
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4. What is hydrogenation?
5. What are conformations?
6. The intermediate carbocation formed in the reactions of $HI , HBr$ and HCl with propene is the same and the bond energy of $HCl , HBr$ and HI is $430.5 kJ mol ^{-1}, 363.7 kJ mol ^{-1}$ and $296.8 kJ mol ^{-1}$ respectively. What will be the order of reactivity of these halogen acids?
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Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is 2.5 × 1015, calculate the energy of the source.
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The standard Gibbs energy change for the reaction, $\text{N}_2(\text{g})+3\text{H}_2(\text{g})\rightleftharpoons2\text{NH}_3(\text{g})$ is -33.2kJ mol-1 at 298K.
  1. Calculate the equilibrium constant for the above reaction.
  2. What would be the equilibrium constant if the reaction is written as $\frac{1}{2}\text{H}_2(\text{g})+\frac{3}{2}\text{H}_2(\text{g})\rightleftharpoons\text{NH}_3(\text{g})$
  3. What will be the equilibrium constant if the reaction is $\text{NH}_3(\text{g})\rightleftharpoons\frac{1}{2}\text{N}_2(\text{g})+\frac{3}{2}\text{H}_2(\text{g})$