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Q.

Match the column I with column II and mark the appropriate choice.

 Column I Column II
(A)Mass of H2 produced when 0.5 moles of zinc reacts with excess of HCI(i)3.01 x 1023  molecules
(B)Mass of all atoms of a compound with formula C70H22(ii)6.023 x 1023 molecules
(C)Number of molecules in 35.5 g of Cl2(iii)1.43 x 10-21 g
(D)Number of molecules in 64 g of SO2(iv)1 g
 ABCD
1iiiiviii
2iiiiiiiv
3iviiiiii
4iviiiiii

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a

2

b

1

c

3

d

4

answer is C.

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Detailed Solution

(A)  Zn + 2HCl → ZnCl2 + H2
1 mole of Zn produces 2 g of H2
0.5 mole of Zn will produce 1 g of H2.
(B)  Molar mass of C70H22 = 862
Mass of atoms = 862 16.023 x 1023 - 1.43 x 10-21 g
(C) 71 g of Cl2 = 6.023 x 1023 molecules
35.5 g of Cl2 - 3.01 x 1023 molecules
(D)  Molar mass of SO2 = 64 = 1 mole
64 g of SO2 - 6.023 x 1023 molecules

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