Q1
Assertion (A): The combustion of fuels is an exothermic process.
Reason (R): In combustion, energy is released as heat, so $\Delta H$ is negative.
Choose the correct option:
Reason (R): In combustion, energy is released as heat, so $\Delta H$ is negative.
Choose the correct option:
📝 SolutionCombustion releases large amounts of heat, making it exothermic with negative $\Delta H$. R correctly explains A.
Q2
The SI unit of enthalpy is:
📝 SolutionEnthalpy is a form of energy, measured in joules (J) in SI units.
Q3
A state function depends on:
📝 SolutionA state function (like enthalpy, internal energy) depends only on the initial and final states, not on the path followed.
Q4
Which of these is a state function?
📝 SolutionEnthalpy is a state function. Work and heat are path functions, depending on how the change is carried out.
Q5
At constant volume, the heat change equals the change in:
📝 SolutionAt constant volume no pressure-volume work is done, so the heat exchanged equals the change in internal energy ($\Delta U$).
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Class 11 · Chemistry
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