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JEE Main 2025 (Online) 29th January Evening Shift
Numerical
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In the sulphur estimation, 0.20 g of a pure organic compound gave 0.40 g of barium sulphate. The percentage of sulphur in the compound is __________ $\times 10^{-1} \%$.

(Molar mass : $\mathrm{O}=16, \mathrm{~S}=32, \mathrm{Ba}=137$ in $\mathrm{g} ~\mathrm{mol}^{-1}$ )

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2
JEE Main 2025 (Online) 24th January Evening Shift
Numerical
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In Carius method of estimation of halogen, 0.25 g of an organic compound gave 0.15 g of silver bromide ( AgBr ). The percentage of Bromine in the organic compound is ________ $\times 10^{-1} \%$ (Nearest integer).

(Given : Molar mass of Ag is 108 and Br is $80 \mathrm{~g} \mathrm{~mol}^{-1}$ )

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3
JEE Main 2024 (Online) 9th April Evening Shift
Numerical
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JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 16 English

In the given TLC, the distance of spot A & B are 5 cm & 7 cm, from the bottom of TLC plate, respectively.

$$\mathrm{R}_{\mathrm{f}}$$ value of $$\mathrm{B}$$ is $$x \times 10^{-1}$$ times more than $$\mathrm{A}$$. The value of $$x$$ is __________.

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4
JEE Main 2024 (Online) 1st February Evening Shift
Numerical
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Following Kjeldahl's method, $1 \mathrm{~g}$ of organic compound released ammonia, that neutralised $10 \mathrm{~mL}$ of $2 \mathrm{M} ~\mathrm{H}_2 \mathrm{SO}_4$. The percentage of nitrogen in the compound is ___________ $\%$.
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