Chemistry Question Bank

A reaction has ∆H = – 33 kJ and ∆S = +58 J/K. This reaction would be :

It is impossible for a reaction to take place if (a) H is +ve and  S  is +ve (b) H is –ve and  S  is +ve (c) H is +ve and  S  is –ve (d) H is –ve and  S  is –ve

From the following bond energies: H — H bond energy : 431.37 kJ mol–1 C == C bond energy : 606.10 kJ mol–1 C — C bond energy : 336.49 kJ mol–1 C — H bond energy : 410.50 kJ mol–1 Enthalpy for the reaction, will be (2009)

One mole of an ideal diatomic gas (Cv = 5 cal) was transformed from initial 25°C and 1 L to the state when temperature is 100°C and volume 10 L. The entropy change of the process can be expressed as (R = 2 calories/mo…

The entropy change when two moles of ideal monoatomic gas is heated from 200°C to 300°C reversibly and isochorically?

When one mole of an ideal gas is compressed to half of its initial volume and simultaneously heated to twice its initial temperature, the change in entropy of gas (∆S) is :

In which case change in entropy is negative?

Pick out the wrong statement

G H T S when H S Hence, Correct option is c

Considering entropy (s) as a thermodynamic parameter, the criterion for the spontaneity of any process is (a) system surroundings S S (b) system surroundings S S (c) system S 0 only (d) surroundings S 0only

Enthalpy change for the reaction, 4H(g) 2H (g) → is – 869.6 kJ. The dissociation energy of H–H bond is (CBSE AIPMT 2011)

Which one of the following is correct? (a) G H T S

Unit of entropy is

Which of the following are extensive properties?

Match List I with List II and select the correct answer using the codes given below the lists: List – I List – II A. T G P

Which of the following p-V curve represents maximum work done? (NEET 2022) (a) (b) (c) (d) Ans. (b) Sol. Option (b), represents maximum work done

Which of the following is intensive property?

Assertion: A process is called adiabatic if the system does not exchange heat with the surroundings. Reason: It does not involve increase or decrease in temperature of the system

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure. AB → Isothermal expansion AC → Adiabatic expansion Which of the following options is not correct? (Odisha NEET…

The correct option for free expansion of an ideal gas under adiabatic condition is. (NEET 2020)

For irreversible expansion of an ideal gas under isothermal condition, the correct option is (NEET 2021)

Assertion: Entropy is always constant for a closed system. Reason: Closed system is always reversible.

A reaction having equal energies of activation for forward and reverse reactions has (NEET 2013)

Which of the following statements is correct for the spontaneous adsorption of a gas? (2014)

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition? (2011)