The Solid State : NCERT Exercise Based MCQs (1 to 4/13 Qs) [Difficult level:Easy]

 NCERT Exercise Based MCQs (13 Qs)

 Question:  From NCERT  | NEET   NCERT Excercise Based MCQs [Difficult level:Easy] Helpful? Yes. Share and spread a word. 

.Assertion: The stability of a crystal is reflected by the magnitude of its melting point.

Reason: Greater the intermolecular forces of attraction, the more will be the stability and melting point of the substance.

1.  Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

2.  Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

3.  Assertion is true, but Reason is false.

4.  Both Assertion and Reason are false.

.

.

 ✅ 

 Answer ▽ ✅Verified 

1.  Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Stability of a crystal is reflected in the magnitude of its melting points because higher the melting point, greater is the intermolecular force and greater the intermolecular force greater is the stability. And hence, a substance with higher melting point would be more stable.

Melting temperature is also an indicator of atomic bonding strength and there is relationship with Young's modulus. The general trend is that a higher melting temperature indicates a higher modulus and vice versa.

Boiling point is highly dependent on the intermolecular forces of a compound. Compounds with stronger intermolecular forces, larger masses, and less branching will have higher boiling points.

Which type of solid will have the highest MP?

Ionic solids have highest melting point due to strong electrostatic forces of attraction.

What happens at melting point?

The melting point is the temperature at which a solid changes into a liquid. At its melting point, the disruptive vibrations of the particles of the solid overcome the attractive forces operating within the solid. ... At that temperature, the solid and liquid states of the substance are in equilibrium.

 ⬆️Prev____@organised notes_____Next⬇️

 Question:  From NCERT  | NEET   NCERT Excercise Based MCQs [Difficult level:Easy] Helpful? Yes. Share and spread a word. 

.The packing efficiency of the face-centered cubic unit cell (with the assumptions that atoms are touching each other) is-

1. 52.40 %

2. 68.04 %

3. 74 %

4. 79.06 %

.

.

 ✅ 

 Answer ▽ ✅Verified 

3. 74 %

 ⬆️Prev____@organised notes_____Next⬇️

 Question:  From NCERT  | NEET   NCERT Excercise Based MCQs [Difficult level:Easy] Helpful? Yes. Share and spread a word. 

.Silver crystallizes in fcc lattice. If the edge length of the cell is 4.07 × 10−8 cm and density is 10.5 g cm−3. The atomic mass of silver is -

1. 120.31 g ${\mathrm{mol}}^{-1}$

2. 107.9 g ${\mathrm{mol}}^{-1}$

3. 207.60 g ${\mathrm{mol}}^{-1}$

4. 138.52 g ${\mathrm{mol}}^{-1}$

.

.

 ✅ 

 Answer ▽ ✅Verified 

2. 107.9 g ${\mathrm{mol}}^{-1}$

 ⬆️Prev____@organised notes_____Next⬇️

Next Questions 8/13 are in next page.