1
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
0.4 g mixture of NaOH, Na2CO3 and some inert impurities was first titrated with $${N \over {10}}$$ HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of Na2CO3 in the mixture is ________. (Rounded off to the nearest integer)
Your input ____
2
JEE Main 2020 (Online) 5th September Evening Slot
Numerical
+4
-0
The volume, in mL, of 0.02 M K2Cr2O7 solution
required to react with 0.288 g of ferrous
oxalate in acidic medium is _______.
(Molar mass of Fe = 56 g mol–1)
(Molar mass of Fe = 56 g mol–1)
Your input ____
3
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
A 100 mL solution was made by adding 1.43 g
of Na2CO3.xH2O. The normality of the solution
is 0.1 N. The value of x is _____.
(The atomic mass of Na is 23 g/mol)
(The atomic mass of Na is 23 g/mol)
Your input ____
4
JEE Main 2020 (Online) 2nd September Evening Slot
Numerical
+4
-0
The oxidation states of transition metal atoms
in K2Cr2O7, KMnO4 and K2FeO4, respectively,
are x, y and z. The sum of x, y and z is _______.
Your input ____
Questions Asked from Redox Reactions (Numerical)
Number in Brackets after Paper Indicates No. of Questions
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