`CO` is more effective reducing agent than coke below 983 K, but above 983 K the reverse is true. Why? 

Some statements about heavy water are given below. (i) Heavy water is used as a moderator in nuclear reactors (ii) Heavy water is more associated than ordinary water. (iii) Heavy water is more effective solvent than ordinary water Which of the above statements are correct ?

At 473K, equilibrium constant K_(C) for the decompositioni of phosphorus pentachloride, PCl_(5) is 8.3xx10^(-3) . If the decomposition is depicted as: PCl_(5)(g)hArrPCl_(3)(g)+Cl_(2)(g)DeltaH=124.0 kJ "mol"^(-1) a. Write an expression of K_(c) for the reaction. b. What is the value of K_(c) for the reverse reaction at the same temperature? c. What would be effect on K_(c) if (i) more PCl_(5) is added (ii) pressure is increased (iii) the temperature in increased.

Statement-I: The number of integral values of K for which the equation (x^(2))/(3K-2) +(y^(2))/(K-10)=1 represents a hyperbola is 10. Statement-II : The above equation represents a rectangular hyperbola for K =3. Which of above statements is true

All titration which involves the direct titration of Iodine with a reducing agent are grouped under lodimetry. Iodimetry is employed to determine the strength of reducing agent such as sodium thio sulphate I_(2) + 2Na_(2)S_(2)O_(3) rarr 2I^(-)+S_(4)O_(6)^(-) If iodine is liberated as a result of chemical reaction involving oxidation of an idodide ion by a strong oxidizing agent in neutral or acidic medium the liberated iodine is then titrated with reducing agent. This titration is called lodometry. Todometry is used to estimate the strength of oxidizing agent. For example the estimation of Cu^(++) with thiosulphate. Cu^(+ +) +I^(-) Cu_(2)I_(2)+I_(2) , I_(2) +S_(2)O_(3)^(-) rarrS_(4)O_(6)^(-) +I^(-) Starch used as indicator near the end point which form blue colour complex with I_(3)^(-) . The blue colour disappears when In the reaction, 2CuSO_(4) +4KI rarr Cu_(2)I_(2) + 2K_(2)SO_(4)+I_2 the ratio of equivalent weight of CuSO_4 to its molecular weight is:

Between C and CO, which is a better reducing agent at 673K.

0.1 M AlCl_3 solution is more effective than 0.1M NaCl solution in coagulating arsenious sulphide sol while 0.1 M AlCl_3 , is less effect than 0.1M Na_3 PO_4 , solutions in coagulating ferric oxide sol. Why?