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Chemical Reactions and Equations

Chemical reaction & equation

1.A colourless lead salt when heated produces a yellow residue and brown fumes.

Name the lead salt.
Name the brown fumes.
Write balanced chemical equation for the following change. (3)

What happens when a piece of iron metal is placed in copper sulphate solution? Write balanced chemical equation for the following change. (2)
Give reasons for the following

Bags of chips are flushed with nitrogen gas.
Corrosion cause damage to metallic objects. (2)
What is the relationship between oxidation and oxidizing agent in a redox reaction? Write an example of a redox reaction showing the relationship between oxidation and oxidizing agent. (2)
What happens when following reaction takes place? Also write chemical equations and then balance them.

Hydrogen gas combines with nitrogen gas
Hydrogen sulphide burns in air
Barium chloride solution reacts with aluminium sulphate solution.
Potassium metal reacts with water
Nitric acid reacts with slaked lime (5)
Rahul put a substance A in the china dish and left it in the open air near the window. After some time its red colour changes to grey. Translate the above statement in a balanced chemical reaction. Also name the type of the reaction. (2)
In a solution of sodium sulphate a colourless solution is added, which gives an insoluble substance and a soluble substance, sodium chloride. Write the reaction and identify the colourless solution and insoluble substance is formed. (1)
How will you obtain an essential gas for photosynthesis from a calcium compound, which is used to manufacture the raw material for whitewashing? Write balanced chemical equation also. (1)
Give two precautions, which you will take while performing the decomposition of ferrous sulphate crystal. (2)
Correct and balance
Ca + H2O CaOH (2)
Give three differences between displacement and double displacement reaction. (3)
Give one example of
A combination reaction of an element and a compound.
A double displacement reaction.
A decomposition reaction of a compound into two or more compounds .(3)
13.How will you manufacture an organic compound CH4O having molecular mass 32 u with the use of lightest known element. Write balanced chemical equation also.
(2)

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