1. Given below are the figures showing particles of a matter in its three
states at the same temperature and pressure and contained in separate
containers of the same volume. The circles indicate the particles in the
three states of a matter.
O
0
O
O
0
O
o
o
o
O
0000000
0000000
0000000
0000000

O
(iii)
Which figure shows minimum attraction between the particles of the
matter?
(a) Figure (i)
(b) Figure (ii)
(c) Figure (iii)
(d) The figures do not indicate any thing about the inter particle
attraction.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

c) should be the answer.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o