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JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Out of Syllabus
The unit cell of copper corresponds to a face centered cube of edge length 3.596 $$\mathop A\limits^o $$ with one copper atom at each lattice point. The calculated density of copper in kg/m3 is ___________. [Molar mass of Cu : 63.54 g; Avogadro Number = 6.022 $$\times$$ 1023]
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2
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Copper reduces NO$$_3^ - $$ into NO and NO2 depending upon the concentration of HNO3 in solution. (Assuming fixed [Cu2+] and PNO = PNO2), the HNO3 concentration at which the thermodynamic tendency for reduction of NO$$_3^ - $$ into NO and NO2 by copper is same is 10x M. The value of 2x is _______. (Rounded off to the nearest integer)

[Given, $$E_{C{u^{2 + }}/Cu}^o = 0.34$$ V, $$E_{NO_3^ - /NO}^o = 0.96$$ V, $$E_{NO_3^ - /N{O_2}}^o = 0.79$$ V and at 298 K, $${{RT} \over F}$$(2.303) = 0.059]
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3
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is _________ BM.
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4
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)

[Kb = 0.52 K kg mol$$-$$1]
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