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Which of the following organisms are NOT included in the five kingdom system of classification, as per the text?
The summary of 'Biological Classification' states: 'Some acellular organisms like viruses and viroids as well as the lichens are not included in the five kingdom system of classification.'
Cytotaxonomy is a classification tool that relies on information from:
The text indicates: 'Cytotaxonomy that is based on cytological information like chromosome number, structure, behaviour...'
The understanding of the plant kingdom has changed over time. Which of the following groups, previously included, are now excluded from Kingdom Plantae?
The text specifies: 'Fungi, and members of the Monera and Protista having cell walls have now been excluded from Plantae though earlier classifications placed them in the same kingdom.'
Which of the following statements is NOT a fundamental assumption of collision theory?
According to the NCERT text, 'The reason could be that all collisions do not lead to the formation of products.' For a collision to be effective, molecules must collide with sufficient kinetic energy (threshold energy) AND proper orientation. Option o3 incorrectly states that all collisions with energy greater than activation energy lead to product formation, ignoring the orientation factor.
The term 'collision frequency (Z)' in collision theory refers to:
As per the NCERT text, 'The number of collisions per second per unit volume of the reaction mixture is known as collision frequency (Z).'
For a bimolecular elementary reaction A + B → Products, the rate of reaction can be expressed as Rate = $Z_{AB}e^{-E_a/RT}$. What does the term $e^{-E_a/RT}$ represent?
The NCERT text states, 'where $Z_{AB}$ represents the collision frequency of reactants, A and B and $e^{-E_a/RT}$ represents the fraction of molecules with energies equal to or greater than $E_a$.'
Effective collisions are those in which molecules collide with:
The NCERT text clearly defines, 'The collisions in which molecules collide with sufficient kinetic energy (called threshold energy) and proper orientation, so as to facilitate breaking of bonds between reacting species and formation of new bonds to form products are called as effective collisions.'
Which factor is introduced in collision theory to account for the proper orientation of molecules during a collision?
According to the NCERT text, 'To account for effective collisions, another factor P, called the probability or steric factor is introduced. It takes into account the fact that in a collision, molecules must be properly oriented.'
In the modified Arrhenius equation based on collision theory, $k = P Z_{AB}e^{-E_a/RT}$, what role does 'P' play?
The NCERT text states, 'According to collision theory, another factor P called steric factor which refers to the orientation of molecules which collide, is important and contributes to effective collisions, thus, modifying the Arrhenius equation to $k = P Z_{AB}e^{-E_a/RT}$'.
A major drawback of classical collision theory is:
The NCERT text mentions, 'Collision theory also has certain drawbacks as it considers atoms/molecules to be hard spheres and ignores their structural aspect.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.