JEE Main 2017 · 2 Apr · Shift 1 · Chemistry Q48

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ChemistrySingle correct+4 / -1Question 48 of 90

Sodium salt of an organic acid 'X' produces effervescence with conc. $\ce{H2SO4}$ . 'X' reacts with the acidified aqueous $\ce{CaCl2}$ solution to give a white precipitate which decolourises acidic solution of $\ce{KMnO4}$ . 'X' is :

\ce{CH3COONa}

\ce{Na2C2O4}

\ce{C6H5COONa}

HCOONa

Answer and worked solution

Official answer: B

Sodium oxalate:

with conc. $\ce{H2SO4}$ it gives CO and $\ce{CO2}$ (effervescence);
with $\ce{CaCl2}$ it gives white calcium oxalate;
calcium oxalate decolourises acidified $\ce{KMnO4}$ .

Topics:Anion analysis

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JEE Main 2017 · 2 Apr · Shift 1, Chemistry question 48