Chapter 1 Flashcards
(29 cards)
The characteristics of reversible reactions are the following except one:
(i) Products never recombine to form
reactants.
(ii) They never complete
(iii) They have a double arrow between reactants and products.
(iv) They proceed both ways.
Products recombine to form reactants.
In the lime kiln, the reaction:
CaCO3(s) —> CaO(s) + CO2
(a) of high temperature
(b) Cao is more stable than CaCO3
(c) CO2 escapes continuously
(d) Cao is dissociated
CO2 escapes continuously.
For the reaction, 2A(g) + B(g) <———–> 3C: the equilibrium constant is:
(a)[2A][B]/[3C]
(b)[2A]2 [B]/[C]3
(c)[3C]/[2A][B]
(d)[C]3 / [A]2 [B]
[C]3 /[A]2 [B]
When a system is at an equilibrium state:
(a) The concentration of reactants and product becomes equal
(b) The opposing reaction (forward and reverse) stop
(c) The rate of reverse reaction becomes very low
(d) The rate of forward and reverse reactions become equal
The rate of forward and reverse reactions
become equal
Which one of the following statement is not correct about active mass:
(a) rate of reaction is directly propositional to the active mass
(b) active mass is taken in molar concentration
(c) active mass is represented by square brackets
(d) active mass means the total mass of substances
active mass means the total mass of substances
When the magnitude of Kc is very large, it indicates:
(a) reaction consists of almost all products
(b) reaction has almost reactants
(c) reaction has not gone to completion
(d) reaction mixture has negligible
reaction consists of almost all products
When the magnitude of kc is very small, it indicates:
(a) equilibrium will never established
(b) all reactants will converted to products
(c) reaction will go to completion
(d) the amount of product is negligible
the amount of product is negligible.
Reactions which have comparable amount of reactants and products at equilibrium state have:
(a) very small kc value
(b) very large kc value
(c) moderate kc value
(d) none of these
moderate kc value
At dynamic equilibrium:
(a) the reaction stop to proceed
(b) the amount of reactants and products are equal
(c) the speed of the forward and reverse reaction are equal
(d) the reaction can no longer be reversed
the speed of the forward and reverse reaction are equal
In irreversible reactions dynamic equilibrium:
(a) never establishes
(b) establishes before completion of reaction
(c) establishes after completion of reaction
(d) establishes readily
establishes before the completion of reaction
A reverse reaction is one:
(a) which proceed from left to right
(b) in which reactants react to form products
(c) which slows down gradually
(d) which speeds up gradually
Which speeds up gradually
N2 + 3H2 <———> 2NH3
Kc = 2.86 mole-2 dm6
What will be present in the equilibrium mixture:
(a) NH3
(b) N2,H2 and NH3
(c) N2 and H2 only
(d) H2 only
N2,H2 and NH3
For reaction between PCL3 and CL2 to PCL5, the unit of kc are:
(a) mol.dm-3
(b) mol-1.dm-3
(c) mol-1.dm3
(d) mol.dm3
mol-1.dm3
In a chemical reaction, the substances that combine are called:
(a) reactants
(b) products
(c) equilibrium
(d) numerator
reactants
The substances formed during the chemical reactions are called :
(a) reactants
(b) products
(c) radicals
(d) elements
products
In the beginning, the rate of reverse reaction is:
(a) negligible
(b) moderate
(c) very fast
(d) slow
slow
The colour of hydrogen Iodine (HI):
(a) orange
(b) purple
(c) red
(d) colourless
colourless
The colour of iodine is:
(a) black
(b) yellow
(c) purple
(d) green
purple
At the equilibrium state, there are possibilities:
(a) 1
(b) 2
(c) 3
(d) 4
2
When a reaction ceases to proceed the state is called:
(a) static equilibrium
(b) chemical equilibrium
(c) equilibrium constant
(d) dynamic equilibrium
static equilibrium (not confirmed check Textbook)
The Law of mass action was given in:
(a) 1859
(b) 1869
(c) 1879
(d) 1889
1869
Who put forward the law of mass action:
(a) Newton
(b) Charlies
(c) Guldberg and Waage
(d) Boyle
Guldberg and Waage
The unit of molar concentration is:
(a) mol dm-1
(b) mol dm-2
(c) mol-1 dm-1
(d) mol dm-3
mol dm-3
Kc depends upon:
(a) Temperature
(b) Pressure
(c) Volume
(d) Atmosphere
Temperature
