The reaction `Ca+2H_(2)Orarr Ca(OH)_(2)+H_(2)uarr` is an example for …………… reaction.

The reaction 2N_(2)Orarr 2N_(2)+O_(2) is an example for …………..reaction.

PbS+4H_(2)O_(2)toPbSO_(4)+4H_(2)O . The reaction of H_(2)O_(2) with is an example of . .. . reaction.

In the reaction, H_(2)S+H_(2)O_(2) to S+2H_(2)O:

C_(6)H_(12)O_(6)rarr C_(2)H_(5)OH+CO_(2) is ……………….. Chemical reaction.

C_(6)H_(12)O_(6)rarr C_(2)H_(5)OH+CO_(2) is ……………..chemical reaction.

For the reaction, KO_(2) + H_(2)O+CO_(2) rarrKHCO_(3) +O_2 the mechanism of reaction suggests that:

Assertion (A) : CaO+H_(2)Orarr Ca(OH)_(2) is a chemical change. Reason (R) : The original substance does not loss their characteristic properties in chemical change.

From the following data at 25^(@)C {:("Reaction ",Delta_(r) H^(@) kJ//mol),((1)/(2)H_(2)(g) + (1)/(2)O_(2)(g) rarr OH (g),42),(H_(2)(g) + (1)/(2)O_(2)(g) rarr H_(2)O_(g),-242),(H_(2)(g) rarr 2H(g),436),(O_(2)(g) rarr 2O(g),495):} Which of the following statement(s) is/are correct: Statement (a): Delta_(r)H^(@) for the reaction H_(2)O(g) rarr 2H(g) + O(g) Statement (b): Delta_(r)H^(@) for the reaction OH(g) rarr H(g) + O(g) is Statement (c) : Enthalpy of formation of H(g) is -218 kJ/mol Statement (d): Enthalpy of formation of OH(g) is 42 kJ/mol