Question

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vvur uuU TULUI UISLUVUTICS.
2. Do the following questions in the Register:
i) Give a reaction which is associated with a color and physical state change.
ii) During a chemical reaction, a small quantity of light green substance is heated. In beginning
it loses some amount of water and then a suffocating gas is evolved and residue is left.
a) Name the suffocating gas and write its formula.
b) Name the red residue and write its formula.
c) Name the light green coloured substance and write its formula.
iii) Identify the Oxidising agent and Reducing agent in the reactions:
a) Pb2O4+8HCI- PbCl2+ Cl. +4H2O​

Answer 1

i)Reation between iron nail and copper sulphate solution in which colour of the solution changes to pale green from blue and solid copper gets deposited on iron nail.

ii)

a)The suffocatting gas is of burning sulphur.

b)Ferric oxide(Fe2O3

c)Ferrous sulphate(FeSO4)

iii)Oxydising agent-pb2O4

Reducing agent-HCL