1
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
Change Language
In mildly alkaline medium, thiosulphate ion is oxidized by $$MnO_4^ - $$ to "A". The oxidation state of sulphur in "A" is __________.
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2
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
Change Language
The average S-F bond energy in kJ mol$$-$$1 of SF6 is _____________. (Rounded off to the nearest integer)

[Given : The values of standard enthalpy of formation of SF6(g), S(g) and F(g) are - 1100, 275 and 80 kJ mol$$-$$1 respectively.]
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3
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
Change Language
Emf of the following cell at 298K in V is x $$\times$$ 10$$-$$2.

Zn|Zn2+(0.1 M)||Ag+ (0.01 M)|Ag

The value of x is _________. (Rounded off to the nearest integer)

[Given : $$E_{Z{n^{2 + }}/Zn}^\theta = - 0.76V;E_{A{g^{2 + }}/Ag}^\theta = + 0.80V;{{2.303RT} \over F} = 0.059$$]
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4
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
Change Language
The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is ___________.
Your input ____
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