Question

28. A student was given about 2 kg of lead nitrate powder in a boiling tube. He
heated it over the flame. He observed emission of a brown coloured gas.
с
(a) Which gases were evolved? Name them.
for What type of reaction took place?
(c) Write the balanced chemical equation.
(d) How will you test the colourless gas that was evolved during the
reaction? Explain.
(e) Name the product that was formed.

Answer 1

Answer:

1. Nitrogen Dioxide (NO2) and Oxygen (O2) are the gases evolved. This is a decomposition reaction.

2. 2Pb(NO3)2 ---------> 2PbO + 4NO2 + O2

3. The product is lead monoxide which is yellow in color.

Answer 2

Answer:

a. No2 ,reaction, decomposition

c. pb(no3)2----->2pbo+4No2+O2

d. when we add 2g of led nitrate , the No2 gas is evolved and also yellow colour resedued (led oxid) is formed that is yellow colour PPT solid in state .

e. one is Pbo and No2 is formed