Which barium salt is insoluble in water?
a) baco3. b) bacl2
c) ba(clo4)2. d) ba(no3)2

The correct answer is option(A).

Explanation:

Sulfates and carbonates of barium are highly insoluble in water. but they are soluble in acids except sulfuric acid because with sulfuric acid they form barium sulfate which is a highly insoluble salt in water.

Where as barium chloride, barium nitrate and barium perchlorates are highly soluble in water.

Hence, the correct answer is option(A).

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