Assertion :- At constant pressure for the change `H_(2)O(s)rarr H_(2)O(g)` work done is nwgative.
Reason :- During phase transition work done is always negative.

Assertion :- At constant pressure for the change H_(2)O(s)rarr H_(2)O(g) work done is negative. Reason :- During phase transition work done is always negative.

For a phase change: H_(2)O(l)hArrH_(2)O(s) 0^(@)C , 1 bar

For a phase change: H_(2)O(l)hArrH_(2)O(s) 0^(@)C , 1 bar

Assertion :- At constant temp 0^(@)C and 1 atm, the change H_(2)O(s)rarr H_(2)O(l)Delta H and Delta E both are zero. Reason :- During isothermal process H and E both remains constant.

For a phase change H_2O(l)⇌H_2O(s) 0^@C ,1 bar

Assertion : For the change, H_(2)O_((l))rarr H_(2)O_((s)),DeltaH=DeltaU . Reason : No enthalpy change is involved in this process.

Assertion : For the change, H_(2)O_((l))rarr H_(2)O_((s)),DeltaH=DeltaU . Reason : No enthalpy change is involved in this process.

Assertion (A): The enthalpy of formation of H_(2)O(l) is greater than that of H_(2)O(g) . Reason (R ) : Enthalpy change is negative for the condensation reaction H_(2)O(g) rarr H_(2)O(l) .