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The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K if the Henry’s law constants for oxygen and nitrogen are 3.30 × 107 mm and 6.51 × 107 mm respectively, calculate the composition of these gases in water.
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Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.
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Calculate the emf of the cell in which the following reaction takes place:
\[\ce{Ni_{(s)} + 2Ag+ (0.002 M) -> Ni^{2+} (0.160 M) + 2Ag_{(s)}}\]
Given that \[\ce{E^\circ_{cell}}\] = 1.05 V
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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 reaction 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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What is the significance of leaching in the extraction of aluminium?
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How can you separate alumina from silica in a bauxite ore associated with silica? Give equations, if any.
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How is leaching carried out in case of low grade copper ores?
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Indicate the type of isomerism exhibited by the following complex and draw the structure for the isomer:
K[Cr(H2O)2(C2O4)2]
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Indicate the type of isomerism exhibited by the following complex and draw the structure for the isomer:
[Co(en)3]Cl3
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Indicate the type of isomerism exhibited by the following complex and draw the structure for the isomer:
[Co(NH3)5(NO2)](NO3)2
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Indicate the type of isomerism exhibited by the following complex and draw the structure for the isomer:
[Pt(NH3)(H2O)Cl2]
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How many geometrical isomers are possible in the following coordination entity?
[Cr(C2O4)3]3−
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How many geometrical isomers are possible in the following coordination entity?
[Co(NH3)3Cl3]
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Draw the structure of optical isomers of [Cr(C2O4)3]3−.
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