Short Answer Type(a) Calculate 
for the reaction
Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s)
Given : E°cell = + 2.71 V, 1 F = 96500 C mol−1
(b) Name the type of cell which was used in Apollo space programme for providing electrical power.
(a) For the cell reaction,
Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s) E°cell = + 2·71 V
The change in the standard Gibbs free energy is given as:
= −nFE°cel. = −2 x 96500 x 2.71 = -523030 Jmol−1
b) The fuel cell which uses the reaction of hydrogen with oxygen to form water was used in Apollo space programme for providing electrical power.
The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
|
Experiment |
Time/s−1 |
Total pressure/atm |
|
1 |
0 |
0·4 |
|
2 |
100 |
0·7 |
Calculate the rate constant.
(Given : log 4 = 0·6021, log 2 = 0·3010)
Give reasons for the following:
(i) (CH3)3P = O exists but (CH3)3N = O does not.
(ii) Oxygen has less electron gain enthalpy with the negative sign than sulphur.
(iii) H3PO2 is a stronger reducing agent than H3PO3.
(i) Write the IUPAC name of the complex [Cr(NH3)4Cl2]Cl.
(ii) What type of isomerism is exhibited by the complex [Co(en)3]3+?
(en = ethane-1,2-diamine)
(iii) Why is [NiCl4]2− paramagnetic but [Ni(CO)4] is diamagnetic?
(At. nos. : Cr = 24, Co = 27, Ni = 28)
The conversion of primary aromatic amines into diazonium salts is known as __________ .
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