Chemical Equilibrium Test 02

Total Questions: 20

1 - Dynamic means, reaction is:

A ) in forward direction
B ) stopped
C ) in reverse direction
D ) Still continuing ✅

2 - The forward reaction takes place from:

A ) right to left
B ) left to right ✅
C ) Both a & b
D ) None of the above

3 - The units of molar concentration:

A ) mol.dm -²
B ) mol.dm-¹
C ) mol.dm
D ) mol.dm-³ ✅

4 - " Kc" is always equal to:

A ) Rf/Rr
B ) Kr/Kf
C ) Kf/kr ✅
D ) Rr/Rf

5 - If Qc < Kc, the reaction goes in:

A ) forward ✅
B ) reverse
C ) at equilibrium state
D ) none of the above

6 - Who proposed the Law of Mass Action?

A ) Newton
B ) Boyles
C ) Guldberg and Waage ✅
D ) Lavoisier

7 - The value of Kc depends on:

A ) Initial concentration of the reactants
B ) Initial concentration of the products
C ) Temperature of the system ✅
D ) Initial concentration of both reactants and products.

8 - Law of Mass Action describes the relationship between active masses of the reactants and:

A ) Concentration of products
B ) Rate of the reaction ✅
C ) Conditions of the reaction
D ) All of the above

9 - Molar concentration of substance having units of mol dm-³ and expressed in square brackets is termed as:

A ) Molarity
B ) Molar concentration
C ) Active mass ✅
D ) None of these

10 - While writing the Kc expression of the reaction, products and reactants are written respectively as:

A ) Numerator and denominator ✅
B ) Denominator and numerator
C ) Numerator
D ) None of these

11 - oxidation of carbon monoxide goes to completion at:

A ) 500 k
B ) 700 K
C ) 1000 K ✅
D ) 1200 K

13 - CaCO3 decomposes to produce:

A ) CaO
B ) CaO + CO2 ✅
C ) CaO + CO
D ) CO2 + CO

14 - When we put concentrations of substances into the equilibrium constant expression, we obtain a value called:

A ) Equilibrium constant
B ) Equilibrium quotient
C ) Reaction quotient ✅
D ) Stability quotient

15 - Equilibrium state is achievable in:

A ) Closed system ✅
B ) Open system
C ) Both (a) & (b)
D ) None of these

16 - A complete reaction is in which:

A ) All the reactants convert into products ✅
B ) All the reactants do not convert into products
C ) Half reactants convert into products
D ) Only 10% reactants convert into products

17 - In the beginning the rate of reverse reaction is:

A ) Moderate
B ) Negligible ✅
C ) Slow
D ) Very fast

18 - The new substance formed in a chemical reaction is:

A ) Reactant
B ) Product ✅
C ) Forward
D ) Reverse

19 - Kc depends upon:

A ) Temperature ✅
B ) Pressure
C ) Volume
D ) Atmosphere

20 - For reaction having large Kc value, the reaction proceeds to:

A ) Completion ✅
B ) equilibrium state
C ) backward
D ) none of the above