Solid State Quiz-5
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 resistance of mercury becomes almost zero at :
Solution
Most of the metals have their transition temperature (i.e., the temperature at which a substance starts to behave as super conductor) in the range of 2-5 K.
Most of the metals have their transition temperature (i.e., the temperature at which a substance starts to behave as super conductor) in the range of 2-5 K.
Q2.The arrangement
ABC ABC……is referred to as,
Solution
It represents ccp arrangement.
It represents ccp arrangement.
Q3. Which one of the following defects in the crystals lowers its density?
Solution
Schottky defects - This defect is due to vacancy at a cation site accompanied by vacancy at an anion site so that the electrical neutrality of the system is maintained. Due to this defect, density decreases.
Schottky defects - This defect is due to vacancy at a cation site accompanied by vacancy at an anion site so that the electrical neutrality of the system is maintained. Due to this defect, density decreases.
Q4. When light strikes a photographic (AgBr) paper, silver atoms move in through these defects to :
Solution
The ions leave its correct lattice site and occupies an interstitial site.
The ions leave its correct lattice site and occupies an interstitial site.
Q5.A solid having definite geometrical shape with flat faces and sharp edges is :
Solution
A crystalline solid is one in which atoms are arranged in an orderly manner in a three dimensional region to provide a definite shape and sharp melting point. These have flat faces, sharp edges bounded by well defined plane faces.
A crystalline solid is one in which atoms are arranged in an orderly manner in a three dimensional region to provide a definite shape and sharp melting point. These have flat faces, sharp edges bounded by well defined plane faces.
Q6. Graphite is a
Solution
Graphite is an example of covalent solid.
Graphite is an example of covalent solid.
Q7.Solids are characterised by their properties :
Solution
These are characteristics of solids.
These are characteristics of solids.
Q8.An increase in the charge of the positive ions that occupy lattice positions brings in a /an ….in
metallic bonding.
Solution
An increase in charge of +ve ions also brings in an increase in number of electrons involved in metallic crystals, and thereby metallic bonding becomes stronger.
An increase in charge of +ve ions also brings in an increase in number of electrons involved in metallic crystals, and thereby metallic bonding becomes stronger.
Q9. High thermal conductivity of metals is due to transfer of heat through :
Solution
Electronic collisions are responsible for metallic conduction and heat conduction in metals.
Electronic collisions are responsible for metallic conduction and heat conduction in metals.
Q10. Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?
Solution
In fcc unit cell
In fcc unit cell
