Chemistry MCQs for NEET — Practice Questions with Answers

Work is not a state function as during a process its value depends on the path followed. The value of enthalpy, internal energy and entropy depends on the state and not on the path followed to get that state, hence these are state functions.

Surface tension is an intensive property which do not depend upon the quantity of matter present in the system.

First low of thermodynamics is also known as Law of conservation of mass and energy.

Formation of CO₂ from CO is an exothermic reaction; heat is evolved from the system, i.e., energy is lowered. Thus, exothermic reactions occur spontaneously on account of decrease in enthapy of system. Thus, ΔE > ΔH.

ΔH = ΔE + PΔV.

$\Delta n_g=1-\frac{3}{2}=\frac{-1}{2}$, As $\Delta n_g$ is negative, thus ΔH < ΔE.  

Bomb calorimeter is commonly used to find the heat of combustion of organic substances which consists of a sealed combustion chamber, called a bomb. If a process is run in a sealed container then no expansion or compression is allowed, so w = 0 and ∆U = q.

∆U < 0, w = 0

If Δn = –ve than ΔH < ΔE.

It is a combustion reaction, ΔH = –ve.

$W=2.303nRT\log \frac{V_2}{V_1}$

$=2.303\times 1\times 8.314\times {10}^7\times 298\log \frac{20}{10}$

$=298\times {10}^7\times 8.314\times 2.303\log 2$.