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P-Block Quiz-6

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 role of fluorspar () which is added in small quantities in the electrolytic reduction of
alumina dissolved in fused cryolite () is:
  •  As a catalyst
  •  To make the fused mixture very conducting
  •  To increase the temperature of the melt
  •  To decrease the rate of oxidation of carbon at the anode
Solution
Addition of  to alumina dissolved in  makes it more conducting.

Q2.Prussic acid is the name of :
  •  PH3
  •  HPO3
  •  HCN
  •  HNC
Solution
HCN

Q3.  Annealing of glass is done to:
  •  Make it more brittle
  •  Make it opaque
  •  Check it from becoming brittle
  •  Make it transparent
Solution
The phenomenon of very slow regulated homogeneous cooling of glass to relieve strain is called annealing.

Q4. Boron cannot form which one of the following anions?
  •  
  •  
  •  
  •  
Solution
Due to absence of 2-orbital, maximum covalency is four.
Thus  is not formed,
Thus (a) is not formed.
and  are formed. 

Q5.Carbon cannot be used in the reduction of because
  •  It is an expensive proposition
  •  The enthalpy of formation of    is more than that of 
  •  Pure carbon is not easily available
  •  The enthalpy of formation of  is too high
Solution
 The enthalpy of formation of  is very high and hence, it is not possible to reduce it by carbon.

Q6. Carbon dioxide is used for extinguishing fire because:
  •  It has a relatively high critical temperature
  •  In solid state, it is called dry ice
  • It is neither combustible nor a supporter of combustion
  •  It is a colourless gas
Solution
It is neither combustible nor a supporter of combustion

Q7.Semi water gas is mixture of :
  •  Water gas and producer gas
  •  Water gas and 
  •  Producer gas and 
  •  Producer gas and oil gas
Solution
It is a fact.

Q8.The ability of a substance to assume two or more crystalline structures is called:
  •  Isomerism
  •  Amorphism
  •  Polymorphism
  •  Isomorphism
Solution
This phenomenon for a substance is called polymorphism and also in case, an element does so it is called allotropy.

Q9.The reducing power of divalent species decreases in the order :
  •  Ge > Sn > Pb
  •  Sn > Ge > Pb
  •  Pb > Sn > Ge
  •  None of these
Solution
The stability of + 2 oxidation state shows the order 


Q10. The reducing agent in thermite process is
  •  
  •  
  •  Mg
  • Al
Solution
Al is used as reducing agent in thermite process.


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