1
JEE Main 2022 (Online) 25th June Evening Shift
Numerical
+4
-1
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The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base M(OH)2. The basicity of the acid 'A' is __________.

[M is a metal]

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2
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
10.0 mL of 0.05 M KMnO4 solution was consumed in a titration with 10.0 mL of given oxalic acid dihydrate solution. The strength of given oxalic acid solution is _________ $$\times$$ 10$$-$$2 g/L.

(Round off to the nearest integer)
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3
JEE Main 2021 (Online) 26th February Morning Shift
Numerical
+4
-1
Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ___________.
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4
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)
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