Download App

The Solid State — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State5 Marks
Question
Show that in a cubic close packed structure, eight tetrahedral voids are present per unit cell.
✓

Answer

In ccp, each cube consists of eight cubic components. Number of atoms per unit cell in ccp is $N_c \times$ contribution + $N_f​ \times$ contribution $8\times\frac{1}{6}+6\times\frac{1}{2}=4$

Position of tetrahedral Voids = At the centre of each cubic component Number of tetrahedral voids per unit cell in cubic close packing = 8 × 1 = 8 Number of tetrahedral Voids = 8.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from The Solid State→The Solid State — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Describe how does the enthalpy of reaction remain unchanged when a catalyst is used in the reaction.
→
  1. Complete the following chemical equations for reactions:
i. $\text{MnO}_{4(aq)}^{-}+\text{S}_{2}\text{O}_{3(aq)}^{2-}+\text{H}_{2}\text{O}_{(l)}\rightarrow$
ii. $\text{Cr}_{2}\text{O}^{-}_{7(aq)}+\text{H}_{2}\text{S}_{(g)}+\text{H}^{+}_{(aq)}\rightarrow$
  1. Give an explanation for each of the following, observations:
  1. The gradual decrease in size (actinoid contraction) from element to element is greater among the .actinoids than that among the lanthanoids (lanthanoid contraction).
  2. The greatest number of oxidation states are exhibited by the members in the middle of a transition series.
  3. With the same d-orbital configuration $(d^4) Cr^{2+}$ ion is a reducing agent but $Mn^{3+}$ ion is an oxidising agent.
→
What is vapour pressure? When a non- volatile solute is dissolved in any liquid, the vapour pressure of the liquid decreases. Give reason.
→
Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction.
  1. Methanal
  2. 2-Methylpentanal
  3. Benzaldehyde
  4. Benzophenone
  5. Cyclohexanone
  6. 1-Phenylpropanone
  7. Phenylacetaldehyde
  8. Butan-1-ol
  9. 2,2-Dimethylbutanal.
→
  1. Give reasons for the following:
  1. Sulphur in vapour state shows paramagnetic behaviour.
  2. N-N bond is weaker than P-P bond.
  3. Ozone is thermodynamically less stable than oxygen.
  1. Write the name of gas released when Cu is added to
  1. dilute $HNO_3$
  2. conc. $HNO_3$
→
  1. Account for the following:
i. Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4 .
ii. $Cr ^{2+}$ is a strong reducing agent.
iii. $Cu ^{2+}$ salts are coloured while $Zn ^{2+}$ salts are white.
  1. Complete the following equations:
    1. $2\text{MnO}_{2} + 4\text{KOH} + \text{O}_{2} \xrightarrow{\Delta}$
    2. $\text{Cr}_{2}\text{O}^{2-}_{7}+ 14\text{H}^{+} + 6\text{I}^{-}\rightarrow.$
→
How to determine the vapour pressure and total pressure of the components in binary solution of two volatile liquids? Explain their mathematical form and also explain the graph between mole fraction and vapour pressure for an ideal solution.
→
  1. Define the following terms:
  1. Mole fraction.
  2. Ideal solution.
  1. $15.0\ g$ of an unknown molecular material is dissolved in $450\ g$ of water. The resulting solution freezes at - $0.34^\circ\ C$. What is the molar mass of the material?
($K_f$ for water = $1.86\ K\ kg\ mol^{–1}$).
→
(a) Why $\alpha$-hydrogen of carbonyl compound are acidic in nature?
(b) Explain aldol condensation reaction of ethanal.
→
After watching a programme on TV about the presence of carcinogens (cancer causing agents) Potassium bromate and Potassium iodate in bread and other bakery products, Rupali a Class XII student decided to make others aware about the adverse effects of these carcinogens in foods. She consulted the school principal and requested him to instruct the canteen contractor to stop selling sandwiches, pizzas, burgers and other bakery products to the students. The principal took an immediate action and instructed the canteen contractor to replace the bakery products with some protein and vitamin rich food like fruits, salads, sprouts, etc. The decision was welcomed by the parents and the students.
After reading the above passage, answer the following questions:
  1. What are the values (at least two) displayed by Rupali?
  2. Which polysaccharide component of carbohydrates is commonly present in bread?
  3. Write the two types of secondary structures of proteins.
  4. Give two examples of water soluble vitamins.
→