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Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - JEE MCQ


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10 Questions MCQ Test Daily Test for JEE Preparation - Test: Measurement of ∆U and ∆H: Calorimetry (June 11)

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Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 1

In calorimetry, what is the primary purpose of using a bomb calorimeter?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 1

A bomb calorimeter is primarily used to measure changes in internal energy (ΔU) at constant volume. It is a device designed to carry out combustion reactions in a sealed container, allowing the measurement of heat changes at constant volume.

Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 2

What is the purpose of a coffee cup calorimeter in calorimetry?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 2

A coffee cup calorimeter is used to measure changes in enthalpy (ΔH) at constant pressure. It is designed to prevent the transfer of heat generated during the reaction to the environment.

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Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 3

Which of the following statements about enthalpy is correct?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 3
Enthalpy (H) is the sum of internal energy (U) and the work done on the system at constant pressure. It is represented by the equation: H = U + PV, where P is pressure and V is volume.
Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 4

What is the primary factor contributing to the change in internal energy (ΔU) in a chemical reaction?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 4

The primary factor contributing to the change in internal energy (ΔU) in a chemical reaction is the transfer of heat (q) during the reaction. ΔU = q + w, where q represents heat transfer.

Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 5

What is the change in enthalpy (ΔH) for the combustion of ethylene (C2H4) at 300K, given that the change in internal energy (ΔU) is -1406 kJ for the same reaction?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 5

ΔH = ΔU + ΔngRT, where Δng is the change in the number of moles of gas. In this case, Δng = 2 - 4 = -2. Therefore, ΔH = -1406 + ((-2) x 8.314 × 10-3 x 300) = -1410.9 kJ.

Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 6
Which type of calorimeter is suitable for reactions that do not significantly change the volume and absorb or evolve heat at constant pressure?
Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 6
A coffee cup calorimeter is suitable for reactions that do not significantly change the volume and absorb or evolve heat at constant pressure. It is designed to prevent the transfer of heat to the environment.
Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 7

What is the primary purpose of the bomb in a bomb calorimeter?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 7

The primary purpose of the bomb in a bomb calorimeter is to initiate the combustion process. It contains the sample to be combusted and is pressurized with oxygen to start the reaction.

Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 8

Which equation represents the change in internal energy (ΔU) in a chemical reaction involving heat transfer and work done?

Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 8

The change in internal energy (ΔU) in a chemical reaction involving heat transfer (q) and work done (w) is represented by the equation ΔU = q + w.

Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 9
What is the unit of energy used to measure enthalpy and internal energy?
Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 9
The unit of energy used to measure enthalpy and internal energy is Joules.
Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 10
According to Hess's Law, the enthalpy change of a chemical reaction is independent of:
Detailed Solution for Test: Measurement of ∆U and ∆H: Calorimetry (June 11) - Question 10
According to Hess's Law, the enthalpy change of a chemical reaction is independent of the path the reaction takes. It depends only on the initial and final stages of the reaction and is a state function.
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