Answer the following questions based on the P-T phase diagram of `CO_2`:
`CO_2` is heated to a temperature `70^@C` and compressesothermally. What changes in its properties do you expect to observe?

Answer the following questions based on the P-T phase diagram of CO_2 : (a) CO_2 at 1 atm pressure and temperature - 60 ^@C is compressed isothermally. Does it go through a liquid phase?

Answer the following questions based on the P-T phase diagram of CO_2 : What happens when CO_2 at 4 atm pressure is cooled from room temperature at constant pressure?

Answer the following questions based on the P-T phase diagram of CO_2 : Describe qualitatively the changes in a given mass of solid CO2 at 10 atm pressure and temperature 65^-@C as it is heated up to room temperature at constant pressure

At what temperature and pressure can the solid, liquid and vapour phases of C0_2 co-exist in equilibrium?

Answer the following questions: Specify the oxidation numbers of the metals in the following coordination entities: [Co(H_2O)(CN)(en)_2]^(2+)

A brass wire 1.8 m long at 27^@C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of 39 ^@C , what is the tension developed in the wire, if its. diameter is 2.0 mm? Co-efficient of linear expansion of brass = 2.0 XX 10^-5 K^-1 Young’s modulus of brass = 0.91xx10^11 P

Samples of four metals A,B,C and D were taken and added to the following solutions one by one.The results obtained have been tabulated as follows. Use the table above to answer the following questions about metals A,B,C and D. (i)Which is the most reactive metal? (ii)What would you observe if B is added to a solution of copper (II) sulpahate? (iii)Arrange the metals A,B,C and D in the order of decreasing reactivity.

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following: Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface?

A first order gas phase reaction A_2B_2(g) rarr 2A(g)+2B(g) at the temperature 400^@C has the rate constant k=2.0xx10^(-4)sec^(-1). What percentage of A_2B_2 is decomposed on heating for 900 secs (antilog 0.0781=1.197)

A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250 ^@C , if the original lengths are at 40.0 ^@C ? Is there a ‘thermal stress’ developed at the junction? The ends of the rod are free to expand (Co-efficient of linear expansion of brass = 2.0 xx 10^-5K^-1 steel = 1.2 xx 10^-5 K^-1) .