• 072920 77839
  • info@smartachievers.in
Menu
Back
  • JEE ADVANCE
  • JEE MAIN
  • NEET
  • BITSAT
  • CBSE BOARD
  • UP BOARD
  • CUET
JEE ADVANCE
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
JEE MAIN
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
NEET
  • CLASS XI - XII
  • CRASH COURSE
BITSAT
  • CLASS XI - XII
CBSE BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
  • CLASS VI
  • CLASS VII
  • CLASS VIII
UP BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
CUET
  • CRASH COURSE
Courses


Solution


Q.

Assertion: Alloys are commonly used in electrical heating devices like electric iron and heater.
Reason: Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points than their constituent metals.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct, but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true  

Ans.

(2)

An alloy is combination of a metal and a non-metal. So it has partial characteristics of metal and non-metal. In an alloy the ions are randomly arranged. It does not have a specific arrangement of ions. Hence, the flow of electrons in this is more. This feature of alloy leads to increase in resistivity due to free crystal lattice. Thus, both assertion and reason are correct but reason is not the correct explanation of the assertion.