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JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
0.8 g of an organic compound was analyzed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then ______________ mL of 1 M H2SO4 would have been neutralized by the ammonia evolved during the analysis.
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2
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mL of 0.02 M solution of K2Cr2O7 was required to get the end point. The molarity of the solution containing Fe2+ ions is x $$\times$$ 10$$-$$2 M. The value of x is __________. (Nearest integer)
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3
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ___________ $$\times$$ 10$$-$$1 g. (in nearest integer)
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4
JEE Main 2021 (Online) 22th July Evening Shift
Numerical
+4
-1
Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene __________. (Nearest integer)
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