Question
Write the differences between thermoplastic and thermosetting polymers?
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Two elements A and B form compounds having formula AB2 and AB4. When dissolved in 20 g of benzene $\left( C _6 H _6\right), 1 g$ of $AB _2$ lowers the freezing point by 2.3 K whereas 1.0 g of AB4 lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol-1. Calculate atomic masses of A and B.
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The experimental data for decomposition of N2O5
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→$\left[2 N_2 O _5 \rightarrow 4 NO _2+ O _2\right]$
in gas phase at 318 K are given below :
| t/s | $10^{-2} \times\left[ N _2 O _5\right] / mol L ^{-1}$ |
| 0 | 1.63 |
| 400 | 1.36 |
| 800 | 1.14 |
| 1200 | 0.93 |
| 1600 | 0.78 |
| 2000 | 0.64 |
| 2400 | 0.53 |
| 2800 | 0.43 |
| 3200 | 0.35 |
(i) Plot [N2O5] against t.
(ii) Find the half-life period for the reaction.
(iii) Draw a graph between log[N2O5] and t.
(iv) What is the rate law?
(v) Calculate the rate constant.
(iv) Calculate the half-life period from k and compare it with (ii).
In the reaction
$Q + R \rightarrow$ Products
The time taken for $99\%$ reaction of $Q$ is twice the time taken for $90\%$ reaction of $R.$ The concentration of $R$ varies with time as shown in the figure given alongside.
What is the overall order of the reaction? Give the units of the rate constant for the same. Write the rate expression for the above reaction.
→$Q + R \rightarrow$ Products
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What is the overall order of the reaction? Give the units of the rate constant for the same. Write the rate expression for the above reaction.
For the decomposition of azoisopropane to hexane and nitrogen at 543 K, the following data are obtained.
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| t(sec) | p(mm of Hg) |
| 0 | 35.0 |
| 360 | 54.0 |
| 720 | 63.0 |
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