JEE Main 2024 · ChemistryNumerical answerNumerical valueEasyMulti-step

JEE Main 31 January 2024, Shift 1, Chemistry Q90

Question 90 of 90 in this shift, Chemistry question 30 of 30, Section B.

Molar mass of the salt from

\mathrm{NaBr}

\mathrm{NaNO_3}

\mathrm{KI}

and

\mathrm{CaF_2}

which does not evolve coloured vapours on heating with concentrated

\mathrm{H_2SO_4}

is __________ g mol

^{-1}

. (Molar mass in g mol

^{-1}

: Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)

Official answer

NTA final key.

Chapter: Practical Chemistry (Qualitative Analysis)
Topic: Anion Analysis
Idea tested: Conc Acid Group Identification

Same topic in other shifts

All Anion Analysis questions

5 Apr 2026, Shift 2 · Q70A paper dipped in a dil. $\mathrm{H_2SO_4}$ solution of 'X' upon treatment with $\mathrm{SO_2}$ gas turns into green. The compound 'X' is :EasySingle correct
2 Apr 2025, Shift 2 · Q62Formation of $\mathrm{Na_4[Fe(CN)_5NOS]}$ , a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate…EasySingle correct
6 Apr 2024, Shift 2 · Q72During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in…EasySingle correct
8 Apr 2024, Shift 1 · Q73Match List I with List II LIST I (Compound): A. $\mathrm{Fe_4[Fe(CN)_6]_3\cdot xH_2O}$ ; B. $[\mathrm{Fe(CN)_5NOS}]^{4-}$ ; C.…MediumMatch the list
29 Jan 2024, Shift 1 · Q79In chromyl chloride test for confirmation of $\mathrm{Cl^-}$ ion, a yellow solution is obtained. Acidification of the solution and…MediumSingle correct
30 Jan 2024, Shift 1 · Q79Given below are two statements : Statement (I) : The gas liberated on warming a salt with dil $\mathrm{H_2SO_4}$ , turns a piece of paper…EasyTwo statements

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.