Assertion : Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature.
Reason : Entropy of the system increases with increase in temperature.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : As a salt such as NaCl dissolves, the Na+ and Cl- ions leaving the crystal lattice acquire far greater freedom.
Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., H has a high positive value and TS a low negative value.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In exothermic reaction heat is :
given out
absorbed
not involved
given out or absorbed
A.
given out
In exothermic reactions heat is always given out by the reaction .For exothermic reactions -
HR > HP
For a spontaneous process the correct statement is
entropy of the system always increases.
free energy of the system always increases.
total entropy change is always negative.
total entropy change is always positive.
The enthaply change () for the reaction
is -92.38 kJ at 298K . The internal energy change at 298K is
-92.38 kJ
-87.42 kJ
-97.34 kJ
-89.9 kJ
A gas can expand from 100 mL to 250 mL under a constant pressure of 2 atm .The work done by gas is :
30.38 joule
25 joule
5 k joule
16 joule
(298 K) of methanol is given by the chemical equation
CH4 (g) + O2 (g) →CH3OH(g)
C (graphite) + O2 (g) + 2H2 → CH3OH(l)
C (diamond) + O2(g) + 2H2(g) → CH3OH(l)
CO(g) + 2H2 → CH3OH(l)
An endothermic reaction with high activation energy for the forward reaction is given by the diagram