JEE Main 2014Chemistryp Block Elements (Group 15, 16, 17 & 18)EasyMCQ

JEE Main 2014p Block Elements (Group 15, 16, 17 & 18) Question with Solution

JEE Main 2014 (09 Apr Online)

Question

The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on hydrolysis gives a white gelatinous precipitate. The precipitate is:

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Show full solutionCorrect option: C
Correct answer
CHydrofluorosilicic acid

Step-by-step explanation

Reactions involved are
CaF2+H2SO4Conc.ΔCaSO4+2HFgSiO2+4HFgΔSiF4g+2H2O3SiF4+2H2O2H2SiF6+SiO2

The mixture after hydrolysis apperas as white gelatinous precipitate.

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About this question

This is a previous-year question from JEE Main 2014, covering the p Block Elements (Group 15, 16, 17 & 18) 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.