Question

ion involved displacement by
38.
ro oxidized and the substances that are reduced in following reactions
A shiny brown colul
X' and the black coloured compound IUTTI
Why do we apply paint on iron articles?
Oil and fat containing food items are flushed with nitrogen. Why?
Explain the following terms with an example each:
(b) rancidity
(a) corrosion
In the refining of silver, the recovery of silver from silver nitrate solution involved disp
copper metal. Write down the reaction involved.
39. Identify the substances that are oxidized and thes
2Na, 0(s)
(1) 4Na(s) +0,(0) -
Cu(s) + H2O
(i) CuO(s) + H2(g) -
Three Mark Questions
The following diagram displays a chemical reaction. Ohsene
questions:
is a chemical reaction. Observe carefully and answer the following
Silver Chloride
take place and define it. How will the colour of the
(a) Identify the type of chemical reaction that will take place and define it Housu
salt change?
(b) Write the chemical equation of the reaction that takes place.
(c/ Mention one commercial use of this salt.
What is rancidity ? Mention any two ways by which rancidity can be prevented.
A reddish brown coloured metal, used in electrical wires, when powdered and heated strongly in
nnan china dich in colour turns hlark When hudrogen gas is passed over this black
3.
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Answer 1

x is carbon

paint is applied to iron to prevent it from getting damage due to action of rust and air and moisture

because nitrogen is not poisoning gas