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Give the significance of a ‘lattice point’.
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Name the parameters that characterize a unit cell.
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Which of the following lattices has the highest packing efficiency (i) simple cubic (ii) body-centred cubic and (iii) hexagonal close-packed lattice?
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What is meant by the term ‘coordination number’?
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How would you determine the standard electrode potential of the system \[\ce{Mg^{2+} | Mg}\]?
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Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions.
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Calculate the standard cell potential of a galvanic cell in which the following reaction takes place:
\[\ce{2Cr_{(s)} + 3Cd{^{2+}_{(aq)}} -> 2Cr{^{3+}_{(aq)}} + 3Cd}\]
Calculate the ΔrG° and equilibrium constant of the reaction.
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A first order reaction has a rate constant 1.15 × 10−3 s−1. How long will 5 g of this reactant take to reduce to 3 g?
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Time required to decompose SO2Cl2 to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.
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The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume.
\[\ce{SO2Cl2_{(g)} -> SO2_{(g)} + Cl2_{(g)}}\]
| Experiment | Time/s–1 | Total pressure/atm |
| 1 | 0 | 0.5 |
| 2 | 100 | 0.6 |
Calculate the rate of the reaction when total pressure is 0.65 atm.
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In a pseudo first order hydrolysis of ester in water, the following results were obtained:
| t/s | 0 | 30 | 60 | 90 |
| [A]/mol L−1 | 0.55 | 0.31 | 0.17 | 0.085 |
Calculate the average rate of reaction between the time interval 30 to 60 seconds.
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The rate constant for a first order reaction is 60 s−1. How much time will it take to reduce the initial concentration of the reactant to its `1/16`th value?
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For the decomposition of azoisopropane to hexane and nitrogen at 543 K, the following data are obtained.
| t (sec) | P(mm of Hg) |
| 0 | 35.0 |
| 360 | 54.0 |
| 720 | 63.0 |
Calculate the rate constant.
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The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K. If the value of A is 4 × 1010 s−1. Calculate k at 318 K and Ea.
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Write any two characteristics of chemisorption.
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Why are powdered substances more effective adsorbents than their crystalline forms?
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Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
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What is the difference between physisorption and chemisorption?
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Give reason why a finely divided substance is more effective as an adsorbent.
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What are the factors which influence the adsorption of a gas on a solid?
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