Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which characteristic makes hormone receptors specific to a particular hormone?
The NCERT text clearly states: 'Each receptor is specific to one hormone only and hence receptors are specific'.
Cortisol, testosterone, estradiol, and progesterone belong to which class of hormones based on chemical nature?
The NCERT context lists 'steroids (e.g., cortisol, testosterone, estradiol and progesterone)' as a category of hormones based on their chemical nature.
The neural system provides _ coordination, while hormones provide _ coordination.
The text states: 'The neural coordination is fast but short-lived... a special kind of coordination and integration has to be provided. This function is carried out by hormones.'
In which part of the body are 'nuclear receptors' primarily found?
The NCERT text mentions: 'Hormone receptors present on the cell membrane of the target cells are called membrane-bound receptors and the receptors present inside the target cell are called intracellular receptors, mostly nuclear receptors (present in the nucleus)'.
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 $k = P Z_{AB}e^{-E_a/RT}$'.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.