1
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
Change Language
CO2 gas is bubbled through water during a soft drink manufacturing process at 298 K. If CO2 exerts a partial pressure of 0.835 bar then x m mol of CO2 would dissolve in 0.9 L of water. The value of x is ____________. (Nearest integer)

(Henry's law constant for CO2 at 298 K is 1.67 $$\times$$ 103 bar)
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2
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
Change Language
For the reaction

A + B $$\rightleftharpoons$$ 2C

the value of equilibrium constant is 100 at 298 K. If the initial concentration of all the three species is 1 M each, then the equilibrium concentration of C is x $$\times$$ 10$$-$$1 M. The value of x is ____________. (Nearest integer)
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3
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
Change Language
Consider the cell at 25$$^\circ$$C

Zn | Zn2+ (aq), (1M) || Fe3+ (aq), Fe2+ (aq) | Pt(s)

The fraction of total iron present as Fe3+ ion at the cell potential of 1.500 V is x $$\times$$ 10$$-$$2. The value of x is ______________. (Nearest integer)

(Given : $$E_{F{e^{3 + }}/F{e^{2 + }}}^0 = 0.77V$$, $$E_{Z{n^{2 + }}/Zn}^0 = - 0.76V$$)
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4
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
Change Language
At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol$$-$$1 and the enthalpy of vaporisation of the liquid (X) is 98.2 kJ mol$$-$$1. The enthalpy of sublimation of the substance (X) in kJ mol$$-$$1 is _____________. (in nearest integer)
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