Chemistry Question Bank

A reaction occurs spontaneously if (2005)

Identify the correct statement for change of Gibbs’ energy for a system system ( G ) at constant temperature and pressure. (2006)

The enthalpy and entropy change for the reaction: 2(l) 2(g) (g) Br Cl 2BrCl → are 30 kJ mol–1 and 105JK–1 mol–1 respectively. The temperature at which the reaction will be in equilibrium is (2006)

For the gas phase reaction, 5(g) 3(g) 2(g) PCl PCl Cl Which of the following conditions are correct? (2008)

Bond dissociation enthalpy of H₂ Cl₂, and HCl are 434, 242 and 431 kJ mol respectively. Enthalpy of formation of HCl is (2008)

Which of the following are not state functins? (I) q + w (II) Q (III) w (IV) H – TS (2009)

The values of H and S for the reaction, (graphite) 2(g) (g) C CO 2CO → Are 170 kJ and 170 JK–1, respectively. This reaction will be spontaneous at (2009)

G H when S

A sample of liquid in a thermally insulated container (a calorimeter) is stirred by a motor. Taking liquid as a system for this process choose the appropriate option:

E is always positive, when

An ideal gas is taken around the cycle ABCA as shown in P-V diagram The net work done by the gas during the cycle is equal to:

A system absorb 10 kJ of heat at constant volume and its temperature rises from 27°C to 37°C. The value of ∆U is

In a reaction, all reactant and products are liquid, then (a) H E (b) H E (c) H E

Two moles of Helium gas undergo a reversible cyclic process as shown in figure. Assuming gas to be ideal. What is the work done for the process C to D?

An ideal gas receives 10 J of heat in a reversible isothermal expansion. Then the work done by the gas:

In ….. process, work is done at the expense of internal energy.

Based on the first law of thermodynamics, which one of the following is correct?

U q w , is mathematical expression for

Gaseous system is placed with pressure P₁, volume V₁ and  temperature  T1,  it  has  undergone  thermodynamic changes where temperature is remaining constant, it is

According to the first law of thermodynamics, U q w . In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?

The pressure of a gas is 100 kPa. If it is compressed from 1m3 to 10 dm3, find the work done.

G T S  when H

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

For the reaction, X2O₄(l) → 2XO₂(g) ∆U = 2.1 kcal, ∆S = 20 cal K–1 at 300 K Hence, ∆G is (2014)

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