SOLID-STATE-QUIZ-13

Solid State Quiz-13

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

Q1. The pyknometric density of sodium chloride crystal is while is X-ray

density is .The fraction of the unoccupied sites in sodium chloride crystal is :

•  5.96
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Solution

Q2.Which of the following statements about amorphous solids is incorrect?

•  They melt over a range of temperature
•  They are anisotropic
•  There is no orderly arrangement of particles
•  They are rigid and incompressible

Solution
They are anisotropic

Q3.  Quartz is an example of :

•   Chain silicate
•  Infinite sheet silicate
•  Framework silicate
•  Cyclic silicate

Solution
Quartz is a covalent crystal having a framework of silicates, i.e., a three dimensional network when all the four oxygen atoms of each of  tetrahedron are shared.

Q4. In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

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Solution
Suppose atoms of element Y in ccp = 100 

Number of tetrahedral voids =2×100 

Number of atoms of element X=2×200 /3

                                                  =400/3 

                          X/Y=400/300

                       Formula =

Q5.Crystalline solids have :

•  Short range order
•  Long range order
•  Anisotropic distribution
•  No order

Solution
 Crystalline solids are anisotropic in nature.

Q6. Which species is paramagnetic?

•  NO
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•  All are correct

Solution
Each possess unpaired electrons.

Q7.A fcc element (atomic mass = 60) has a cell edge of 400 pm. Its density is :

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•  
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Solution

Q8.Which species is diamagnetic ?

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•  All of these 

Solution
There is no unpaired electron in either of them.

Q9. The portfolios to the central ministers are allocated by:

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•  CsCl
•  KCl
•  NaCl

Solution
The 8:8 type of packing is present in caesium chloride (CsCl). In this structure eachion is surrounded by 8ions and eachion is also surrounded by 8ions.

Q10. Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite :

•  Is a non-crystalline substance
•  Is an allotropic form of diamond
•  Has molecules of variable molecular masses like polymers
• Has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interpolate bonds

Solution
It is a fact.