How many atoms constitute one unit cell of a face-centered cubic

Subject

Chemistry

Class

CBSE Class 12

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 Multiple Choice QuestionsShort Answer Type

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1.

How many atoms constitute one unit cell of a face-centered cubic crystal? 


Number of atoms in one face centred cubic unit cell can be determined:-

 

(i) 8 corners atoms × 1/8 per corner atom =  = 1 atom

(ii) 6 face-centered atoms × 1/ 2 atom per unit cell = = 3 atoms

 

∴ Total number of atoms per unit cell = 4 atoms

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2.

Name the method used for the refining of Nickel metal?

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3.

What is the covalency of nitrogen in N2O5? 

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4.

Arrange the following in increasing order of their basic strength in aqueous solution: 

 CH3NH2, (CH3)3N, (CH3)2NH

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5.

18 g of glucose, C6H12O6 (Molar Mass = 180 g mol-1) is dissolved in 1 kg of water in a saucepan. At what temperature will this solution boil? 

 (Kb for water = 0.52 K kg mol-1, boiling point of pure water = 373.15 K)

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6.

The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm-1. Calculate its molar conductivity?

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7.

Write the dispersed phase and dispersion medium of the following colloidal systems: 

 (i) Smoke (ii) Milk

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8.

What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?

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9.

Write the differences between physisorption and chemisorption with respect to the following:

(i) Specificity

(ii) Temperature dependence

(iii) Reversibility and

(iv) Enthalpy change

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10.

Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver? 

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