IIT-JEE
Exam
Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The
molarity of the solution is
(A) 1.78 M (B) 2.00 M
(C) 2.05 M (D) 2.22 M
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IIT-JEE Other Question
Extra pure N2 can be obtained by heating
(A) NH3 with CuO (B) NH4NO3
(C) (NH4)2Cr2O7 (D) Ba(N3)2
Bombardment of aluminium by a-particle leads to its artificial disintegration in two ways, (i) and (ii) as
shown. Products X, Y and Z respectively are,
(ii) Al¾¾® P + Y 27 30
13 15
(i)
30Si + X
14 30Si + Z