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): Crystalline solids are anisotropic in nature. Reason (R): Some of their physical properties show same electrical and optical properties in different directions in the same 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 (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: 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: Na⁺ and Al³⁺ are isoelectronic but the magnitude of ionic radius of Al³⁺ is less than that of Na⁺ Reason: The magnitude of an effective nuclear charge on the outer shell electrons in Al³⁺ is greater than that of Na⁺. [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: 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: 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

Study the diagram given below and answer the following questions: [Assertion-Reason Type Questions] [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 1) Assertion (A): The diagram shows Schottky defect. Reason (R): Schottky defect occurs in ionic solids. 2) Assertion (A): LiCl Crystal is pink. Reason (R): Pink colour of LiCl crystal is due to excess Lithium. 3) Assertion (A): The crystal lattice density increases due to the defect shown in the diagram. Reason (R): Tetrahedral voids are surrounded by 4 constituent particles. 4) Assertion (A): AgCl shows Frenkel defect while NaCl does not. Reason (R): Frenkel defect is shown when anionic vacancies are occupied by unpaired electrons.