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JEE Main 202315 AprilMorning Shift
Exam
JEE Main
Year
2023
Date
15 April
Shift
Morning Shift
Subject
Chemistry
Chapter
s Block Elements

JEE Main 2023 · 15 April · Morning Shift · Chemistry · s Block Elements

Given below are two statements: One is labelled as Assertion A and...

Given below are two statements: One is labelled as Assertion AA and the other is labelled as Reason RR:

Assertion (A) : BeCl2{BeCl}_{2} and MgCl2{MgCl}_{2} produce characteristic flame

Reason (R) : The excitation energy is high in BeCl2{BeCl}_{2} and MgCl2{MgCl}_{2}

In the light of the above statements, choose the correct answer from the options given below:

Options

  1. A(A)\left(A\right) is true but (R)\left(R\right) is false
  2. BBoth (A)\left(A\right) and (R)\left(R\right) are true but (R)\left(R\right) is NOT the correct explanation of (A)\left(A\right)
  3. CBoth ((A)\left(A\right) and (R)\left(R\right) are true and (R)\left(R\right) is the correct explanation of (A)\left(A\right)
  4. D(A)\left(A\right) is false but (R)\left(R\right) is true

Correct answer

D. (A)\left(A\right) is false but (R)\left(R\right) is true

Step-by-step solution

In BeandMgBe\text{and}Mg, the electrons are strongly bound. The energy required to excite these electrons is very high. Therefore, when the electron reverts back to its original position, the energy released does not fall in the visible region. Hence, no colour in the flame is seen.

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