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1
JEE Main 2021 (Online) 26th August Morning Shift
Numerical
+4
-1
The OH$$-$$ concentration in a mixture of 5.0 mL of 0.0504 M NH4Cl and 2 mL of 0.0210 M NH3 solution is x $$\times$$ 10$$-$$6 M. The value of x is ___________. (Nearest integer)

[Given Kw = 1 $$\times$$ 10$$-$$14 and Kb = 1.8 $$\times$$ 10$$-$$5]
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2
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
The equilibrium constant for the reaction

A(s) $$\rightleftharpoons$$ M(s) + $${1 \over 2}$$O2(g)

is Kp = 4. At equilibrium, the partial pressure of O2 is _________ atm. (Round off to the nearest integer)
Your input ____
3
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
2SO2(g) + O2(g) $$\to$$ 2SO3(g)

The above reaction is carried out in a vessel starting with partial pressure PSO2 = 250 m bar, PO2 = 750 m bar and PSO3 = 0 bar. When the reaction is complete, the total pressure in the reaction vessel is _______ m bar. (Round off of the nearest integer).
Your input ____
4
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
PCl5 $$\rightleftharpoons$$ PCl3 + Cl3

Kc = 1.844

3.0 moles of PCl5 is introduced in a 1 L closed reaction vessel at 380 K. The number of moles of PCl5 at equilibrium is ______________ $$\times$$ 10$$-$$3. (Round off to the Nearest Integer)
Your input ____
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