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Thermal Expansion

12.976g of le...

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12.976g of lead combines with 2.004g of oxygen to form Pro. People can also be produced by heating lead nitrate and it was found that the percentage of oxygen present in pbo is 13.38%.with the help of given information illustrate the laws of constant composition.

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Calculate the percentage composition of oxygen in lead nitrate [Pb(NO₃)₂].
(Pb = 207, N = 14, O = 16)

S O_{2}

gas was prepared by
(i) burning sulphur in oxygen,
(ii) reacting sodium sulphite with dilute

H_{2} S O_{4}

and
(iii) heating copper with

c o n c . H_{2} S O_{4}

. It was found that in each case sulphur and oxygen combined in the ratio of 1 : 1. The data illustrates the law of :

Q. Two samples of lead oxide were separately reduced to metallic lead by heating in hydrogen. The percentage weight of lead from one oxide was half the percentage weight of lead obtained from the other oxide. The data illustrates the law of:

2.8 g

of calcium oxide prepared by heating limestone were found to contain

0.8 g

of oxygen. When one gram of oxygen was treated with calcium,

3.5 g

of calcium oxide was obtained. Show that the results illustrate the law of definite proportions.

Q. Lead nitrate crystals on strong heating decompose to form lead monoxide, nitrogen dioxide gas and oxygen gas.

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