The potential energy diagram for a reaction R → P is given i

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

371.

Assertion : Water in liquid state is more stable than ice at room temperature.

Reason : Water in liquid form has higher entropy than ice.

  • If both assertion and reason are true and reason is the correct explanation of the assertion.

  • If both assertion and reason are true but reason is not the correct explanation of the assertion.

  • If assertion is true, but reason is false.

  • Both assertion and reason are false statements.


372.

Assertion : First ionization energy for nitrogen is lower than oxygen.

Reason : Across a period effective nuclear charge decreases.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


373.

The heat of neutralization of a strong base and a strong acid is 57 kJ. The heat released when 0.5 mole of HNO3 solution is added to 0.20 moles of NaOH solution, is :

  • 11.4 kJ

  • 34.7 kJ

  • 23.5 kJ

  • 58.8 kJ


374.

How much energy is released when 6 moles of octane is burnt in air? Given Hf° for CO2(g) , H2O(g) and C8H18(l)  respectively are - 490, -240 and +160 kJ/mol.

  • -6.2 kJ

  • -37.4 kJ

  • -35.5 kJ

  • -20.0 kJ


Advertisement
375.

For the equilibrium H2O(l)  H2O(g) at 1 atm and 298K.

  • standard free energy change is equal to zero (G°= 0)

  • free energy change is less than zero (G° < 0)

  • standard free energy change is less than zero (G°< 0)

  • standard free energy change is greater than zero (G° > 0).


376.

Of the following which change will shift the reaction towards the product?

I2(g) 2I(g), Hf° (298K) = +150kJ

  • Increase in concentration of I

  • Decrease in concentration of I2

  • Increase in temperature

  • Increase in total pressure


377.

One gram sample of NH4NO3 is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K. The heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition for NH4NO3 ?

  • -7.53 kJ/mol

  • -398.1 kJ/mol

  • -16.1 kJ/mol

  • -602 kJ/mol


378.

Which one of the following has S° greater than zero?

  • CaO(s) + CO2(g)  CaCO3(s)

  • NaCl(aq) NaCl(s)

  • NaNO3(s)  Na+(aq) + NO3-(aq)

  • N2(g) + 3H2(g)  2NH3(g)


Advertisement
Advertisement

379.

The potential energy diagram for a reaction R → P is given in the figure. H ° of the reaction corresponds to the energy

  • a

  • b

  • c

  • a + b


C.

c

In the above diagram, H° of the reaction corresponds to energy c. 

H = activation energy of forward reaction - activation energy of backward reaction

      = b - a = c


Advertisement
380.

Assertion : The increase in internal energy (E) for the vapourization of one mole of water at 1 atm and 373 K is zero.

Reason : For all isothermal processes, E = 0.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


Advertisement