Chemistry MCQs for NEET — Practice Questions with Answers

Enthalpy of the reaction,

 CH₄(g) + 1/2 O₂(g) $\to$CH₃OH (l), is negative. If enthalpy of combustion of CH₄ and CH₃OH are x and y respectively, then which relation is correct?                                 

In the reaction, $∆$H and $∆$S both are positive. In which of the following cases, the reaction would not be spontaneous?

When an ideal gas is compressed adiabatically and reversibly, the final temperature is:

The entropy change in the fusion of one mole of a solid melting at 27$°$C (latent heat of fusion is 2930 J mol^-1) is                                                                                              

The maximum work done in expanding 16 g oxygen at 300 K and occupying a volume of 5 dm³ isothermally until the volume becomes 25 dm³ is:

1 mole of an ideal gas at 25$°\mathrm{C}$ is subjected to expand reversibly ten times of its initial volume. The change in entropy of expansion is:

 During an adiabatic process:

Heat of combustion $∆\mathrm{H}°$ for C(s), H₂(g) and CH₄(g) are -94, -68 and -213 kcal/mol. Then, $∆\mathrm{H}°$ for 

C(s) + 2H₂(g) $\to$CH₄(g) is                                                                 

If 50 calorie are added to a system and system does work of 30 calorie on surroundings, the change in internal energy of system is:

The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path. What would be the change in internal energy?