1
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language
100 ml of 0.0018% (w/v) solution of Cl$$-$$ ion was the minimum concentration of Cl$$-$$ required to precipitate a negative sol in one h. The coagulating value of Cl$$-$$ ion is _________ (Nearest integer)
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2
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
$$PC{l_5}(g) \to PC{l_3}(g) + C{l_2}(g)$$

In the above first order reaction the concentration of PCl5 reduces from initial concentration 50 mol L$$-$$1 to 10 mol L$$-$$1 in 120 minutes at 300 K. The rate constant for the reaction at 300 K is x $$\times$$ 10$$-$$2 min$$-$$1. The value of x is __________. [Given log5 = 0.6989]
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3
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language
Diamond has a three dimensional structure of C atoms formed by covalent bonds. The structure of diamond has face centred cubic lattice where 50% of the tetrahedral voids are also occupied by carbon atoms. The number of carbon atoms present per unit cell of diamond is ____________.
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4
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
An aqueous solution of NiCl2 was heated with excess sodium cyanide in presence of strong oxidizing agent to form [Ni(CN)6]2$$-$$. The total change in number of unpaired electrons on metal centre is _______________.
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