THERMODYNAMICS Quiz-8

CHEMISTRY THERMODYNAMICS QUIZ-8

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1.Which of the following statements is/are correct?:

•  The entropy of the universe decreases and increases at a periodic rate
•  The entropy of the universe increases and tends towards the maximum value
•  For endothermic spontaneous processes the total entropy change decreases
•  The entropy of the universe decreases and tends to zero

Solution
(a,c,d)

Q2.Which of the following are extensive properties?

•  Elevation in boiling point
•  Boiling point
•  Emf of cell
•  E^⊝ of cell

Solution
(a,c)
Mass-independent properties are extensive

Q3.The heat of neutralization of a strong acid by a strong base is a constant because :

•  The strong acid and strong base react completely
•  The strong acid and strong base dissociate completely and only H⁺ and OH^- ions react in every case
•  The salt formed do not hydrolyse
•  There is no side reaction during neutralization

Solution
(b,d)

Q4.In the isothermal expansion of an ideal gas:

•  ∆U = 0
•  ∆T = 0
•   q = 0
•  W = -q

Solution
(a,b,d)

Q5.

•  dU = 0
•  q = -w
•  314 J
•  31.4 J

Solution
 

Q6.Identify the intensive quantities from the following

•  Enthalpy
•  Temperature
• Volume
•  Refractive index

Solution
(b,d)
The quantities that do not depend upon the quantity or mass of a substance are called intensive properties

Q7.Which of the following affect the heat of reaction?

•  Physical states of reactants and products
•  Allotropic forms of elements
•  Temperature
•  Reaction carried out at constant pressure or constant volume

Solution
(a,b,c,d)
In all these process heat of reaction changes

Q8.In which of the following reactions, ∆H > ∆U?

•  H₂(g) + I₂(g) → 2HI(g)
•  PCl₅(g) → PCl₃(g) + Cl₂(g)
•  2H₂O₂(l) → 2H₂O(l) + O_2(g)
•  C(s) + O₂(g) → CO₂(g)

Solution
(b,c)
∆H = ∆U + ∆nRT, where ∆n=n_P-n_R (n=number of moles)

Q9.The criteria for spontaneity of a process is/are

•  (dG)_TP < 0
•  (dE)_SV < 0
•   (dH)_SP < 0
•  (dS)_EV < 0

Solution
(a,b,c)

Q10. Identify the intensive quantities from the following

•  Enthalpy
•  Temperature
•  Volume
•  Refractive Index

Solution
(b,d)