JEE Main 2023ChemistryS Block ElementsPhysiochemical Trends In Alkali MetalseasyMCQ

JEE Main 2023 — S Block Elements Question with Solution

From: JEE Main 2023 (Online) 25th January Evening Shift

Question

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The alkali metals and their salts impart characteristic colour to reducing flame.

Reason R : Alkali metals can be detected using flame tests.

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

Choose an option

Show full solutionCorrect option: A
Correct answer
AA is not correct but R is correct

Step-by-step explanation

Assertion is not correct because alkali metals and their salts impart characteristic colour to oxidising part of flame and not reducing part of flame. Reason is correct because all alkali metals can be detected by their flame tests.

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About this question

This is a previous-year question from JEE Main 2023, covering the S Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.