JEE WhatsApp Group
Sign in
Please select an account to continue using cracku.in
↓ →
JEE WhatsApp Group
Join Our JEE Preparation Group
Prep with like-minded aspirants; Get access to free daily tests and study material.
Molar mass of the salt from $$NaBr, NaNO_3, KI$$ and $$CaF_2$$ which does not evolve coloured vapours on heating with concentrated $$H_2SO_4$$ 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)
Correct Answer: 78
NaBr gives brown/orange vapors (Br₂) with conc H₂SO₄. KI gives violet vapors (I₂). NaNO₃ gives brown NO₂ fumes. CaF₂ does not give colored vapors (HF is colorless).
Molar mass of CaF₂ = 40 + 38 = 78 g/mol.
The answer is $$\boxed{78}$$.
Click on the Email ☝️ to Watch the Video Solution
Create a FREE account and get:
Educational materials for JEE preparation
Ask our AI anything
AI can make mistakes. Please verify important information.
AI can make mistakes. Please verify important information.
