Assertion: In caesium chloride crystal, Cs⁺ is present on the centre of cube of the unit cell.
Reason: For N⁻ atoms adopting fcc arrangement, there are 2N tetrahedral voids.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Reason: For N⁻ atoms adopting fcc arrangement, there are 2N tetrahedral voids.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
Assertion: The packing efficiency is maximum for the fcc structure.
Reason: The coordination number is 12 in fcc structures.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion: Diamond and graphite do not have the same crystal structure.
Reason: Diamond is crystalline while graphite is amorphous.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion (A): Most of the solids possess high melting point.
Reason (R): They have strong intermolecular forces of attraction.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion (A): Amorphous solids possess a long range order in the arrangement of their particles.
Reason (R): The formation of amorphous solids involves very rapid cooling.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion (A): The packing efficiency of simple cubic lattice is 52.4%.
Reason (R): The number of atoms per unit cell is 2.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion (A): Schottky defect arises when a non-ionic solid is heated.
Reason (R): It happens because some of the lattice sites are vacant in the crystal.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion: White ZnO becomes yellow upon heating.
Reason: On heating ZnO loses oxygen and free electrons go into exited stated and upon returning imparts yellow radiation.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Assertion: Glycine is not optically optically active.
Reason: There is no asymmetrical carbon in glycine to make it chiral.
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement.
Assertion :- Interhalogen compounds are more reactive than halogen.
Reason :- They all undergo hydrolysis giving halide, cation derived from the smaller halogen & anion derived from larger halogen.
a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement.
Assertion : -The bond between F-F is weaker than between Cl-Cl.
Reason:- Atomic size of F is smaller than that of Cl.
a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement.
Assertion: The packing efficiency is maximum for the fcc structure.
Reason: The coordination number is 12 in fcc structures.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement
Read the passage given below and answer the following questions:
The polarity of carbon-halogen bond of alkyl halides is responsible for their Nucleophilic substitution, elimination and their reaction with metal atoms to form organ metallic compounds. Nucleophilic substitution reactions are categorized into SN1 and SN2 on the basis of their kinetic properties. Chirality has a profound role in understanding the reaction mechanisms of SN1 and SN2 reactions. SN2 reactions of chiral alkyl halides are characterized by the inversion of configuration while SN1 reactions are characterized by racemisation.
ASSERTION -REASON TYPE
A statement of assertion is followed by a statement of reason. Mark the correct choice from the options given below:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
(i) Assertion : SN2 reactions do not proceed with retention of configuration.
Reason : SN2 reactions proceed in a single step.
(ii) Assertion : Tertiary alkyl halides show high reactivity in SN1 reaction.
Reason : Tertiary carbocation has more stability.
(iii) Assertion : Nucleophilic substitution reaction in an optically active alkyl halide gives a mixture of enantiomers.
Reason : Reaction occurs by SN1 mechanism.
(iv) Assertion : Primary allylic halides show higher reactivity in SN1 reactions than other primary alkyl halides.
Reason : Intermediate carbocation is stabilized by resonance.
Assertion:-The stability of hydrides decreases from \(NH_3\) to \(BiH_3\).
Reason:-There is a decrease in bond dissociation enthalpy of bond E-H from \(NH_3\) to \(BiH_3\). (E=Element of group 15)
a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
c) Assertion is correct statement but reason is wrong statement.
d) Assertion is wrong statement but reason is correct statement.
Assertion (A): The packing efficiency of simple cubic lattice is 52.4%.
Reason (R): The number of atoms per unit cell is 2.
[A] – Assertion & reason both statements are correct and reason is the correct explanation of assertion.
[B] – Assertion & reason both are the correct statements but reason is not the correct explanation of the assertion.
[C] – Assertion is correct statement and reason is incorrect statement.
[D] – Assertion is incorrect statement and reason is correct statement