Question

reaction?
4 Which kind of chemical reaction takes place when
electric current is passed through fused lead
bromide?
Silver article gets black coating. Name the
phenomenon.
5
hort Answer (SA) Type I Questions [2 Marks each]
6
Write any two chemical reactions in which water acts
as a reducing and oxidising agent respectively.
CBSE 2011
7 Identify the type of chemical reaction in the
following:
(i) A+BC (ii) A + BC-AC + B​

Answer 1

Answer:

Which kind of chemical reaction takes place when

electric current is passed through fused lead

bromide?

Answer:Since in this reaction leadbromide break in two molecules , that is Pb and Br so it is called Decomposition reaction

Silver article gets black coating. Name the

phenomenon.

Answer: silver articles turn black when kept in the air because silver article react with Sulphur compounds such as hydrogen sulphide (H2S) present in air phenomena is called corrosion. for silver particles, it is called tarnishing of silver

Write any two chemical reactions in which water acts

as a reducing and oxidising agent respectively.

Answer: With strongly active non metals such as fluorine or chlorine water act as weak reductant and thus released dioxygen

2F^2(g) + 2H^2O(l) = 4HF(aq) + O^2(g)

oxidant. reductant

2Cl^2(g) + 2H^2O(l) = 4HCl(aq) + O^2(g)

oxidant. reductant

Identify the type of chemical reaction in the

following:

(i) A+BC (ii) A + BC-AC + B

Answer: (i) A+BC = AC+B ( displacement reaction)

Hope this will help you