1
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is ___________.
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2
JEE Main 2021 (Online) 24th February Evening Shift
Numerical
+4
-1
The solubility product of PbI2 is 8.0 $$\times$$ 10$$-$$9. The solubility of lead iodide in 0.1 molar solution of lead nitrate is x $$\times$$ 10$$-$$6. mol/L. The value of x is __________. (Rounded off to the nearest integer) [Given $$\sqrt 2$$ = 1.41]
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3
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
If the solubility product of AB2 is 3.20 $$\times$$ 10–11 M3, then the solubility of AB2 in pure water is _____ $$\times$$ 10–4 mol L–1.
[Assuming that neither kind of ion reacts with water]
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4
JEE Main 2020 (Online) 5th September Morning Slot
Numerical
+4
-0
A soft drink was bottled with a partial pressure of CO2 of 3 bar over the liquid at room temperature. The partial pressure of CO2 over the solution approaches a value of 30 bar when 44 g of CO2 is dissolved in 1 kg of water at room temperature. The approximate pH of the soft drink is ______ $$\times$$ 10–1.
(First dissociation constant of
H2CO3 = 4.0 $$\times$$ 10–7; log 2 = 0.3; density
of the soft drink = 1 g mL–1) .
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