1
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be $$-$$0.93$$^\circ$$C (Kf(H2O) = 1.86 K kg mol$$-$$1). The number (n) of benzoic acid molecules associated (assuming 100% association) is ___________.
2
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 ___________.
3
JEE Main 2021 (Online) 26th February Morning Shift
Numerical
+4
-1
A homogeneous ideal gaseous reaction $$A{B_{2(g)}} \rightleftharpoons {A_{(g)}} + 2{B_{(g)}}$$ is carried out in a 25 litre flask at 27$$^\circ$$C. The initial amount of AB2 was 1 mole and the equilibrium pressure was 1.9 atm. The value of Kp is x $$\times$$ 10$$-$$2. The value of x is _________. (Integer answer)

[R = 0.08206 dm3atm K$$-$$1mol$$-$$1]
4
JEE Main 2021 (Online) 24th February Evening Slot
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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