Important Questions and Answers for Class 12 Chemistry Chapter 1 Solid State

Important Questions and Answers for Class 12 Chemistry Chapter 1 Solid State

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Questions and Answers
Chapter 1 The Solid State

Question 1.: Classify the following solids as ionic, metallic, molecular, covalent or amorphous:  

(i) Tetraphosphorus decaoxide [P2O10]     (ii) Graphite   (iii) SiC    (iv) Brass    (v) Rubidium    (vi) I2   (vii) Ammonium phosphate (NH3)3PO4    (viii) LiBr    (ix) Si    (x) Plastics    (xi) Solid CO2

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Question 2.: A compound formed by elements A and B has a cubic structure in which ‘A’ atom are at the corners of the cube and ‘B’ atoms are at the face centeres. Drive the formula of the compound.

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Question 3.: An ionic compound made up of ions A+ and B has face-centered arrangement in which ions A+ are at the corners and ions B are at the face centers, if one of the ions is missing from the corner. What is the simplest formula of the compound?

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Question 4.: Calculate the approximate number of unit cells present in 1g of gold. Given that gold crystallizes in the face-centered cubic lattice. (Atomic mass of gold = 197u)

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Question 5.: Sodium crystallizes in a BCC unit cell. Calculate the approximate number of unit cells in 8.6 g of the sodium (atomic mass of Na = 23)

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Question 6.: Calculate the number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each body diagonal.       

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Question 7.: Gold (atomic radius = 0.144 nm) crystallizes in a face centred unit cell. What is the length of the side of unit cell?                                                                      

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Question 8.: Xenon crystallizes in face-centered cubic lattice and the edge of the unit cell is 620 pm. What is the nearest neighbour distance and what is radius of xenon atom?    

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Question 9.: A solid AB has CsCl type structure. The edge length of the unit cell is 404 pm. Calculate the distance of closest approach between A+ and B ions?           

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Question 10.: A solid is made of two elements P and Q. Atoms Q are in ccp arrangement, while atoms P occupy all the tetrahedral sites. What is the formula of the compound?

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Question 11.: In a cubic close packed structure of mixed oxides, the Lattice is made up of oxide ions (O2-), 1/8th of tetrahedral voids is occupied by divalent ions (A+2) while one half of octahedral voids are occupied by trivalent ions (B+3).  What is the simplest formula of the oxide? 

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Question 12.: In corundum, oxide ions are arranged in hexagonal close packing and Aluminium ions occupy two-third of the octahedral voids. What is the formula of corundum ?

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Question 13.: Predict the structure of MgO crystal and coordination number of its cation in which cation and anion radii are equal to 65 pm and 140 pm respectively. 

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Question 14.: A solid AB has NaCl structure. If the radius of cation A is 110 pm, what is the possible radius of anion B?

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Question 15.: X-ray studies of silver crystals show that it forms CCP lattice and edge length of the unit cell is 408.6 pm. Calculate the density of the silver (atomic mass = 107.9 u)

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Question 16.: The density of copper metal is 8.95 g cm-3. If the radius of copper atom is 127.8 pm, is the copper unit cell a simple cubic or a body-centered cubic or a face-centered cubic? (Given At. Mass of Cu = 63.54 g/mol).

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Question 17.: KF has NaCl structure. What is the distance between K+ and F in KF if density is 2.48 g cm-3?

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Question 18.: The compound CuCl has FCC structure like ZnS. Its density is 3.4 g cm-3. What is the length of the edge of the unit cell?

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Question 19.: If NaCl is doped with 10-3 mol % of SrCl2, what is the concentration of cation vacancy?

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Question 20.: Analysis shows that nickel oxide has formula Ni0.98O1.00 . What fractions of the nickel exist as Ni+2 and Ni+3?

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Boost your self-study.

  • You can read and download our notes
  • You can practice multiple choice questions.
  • You can watch our pre-recorded video lectures. 
  • You can participate in multiple choice questions quiz.