Chemical Reactions and Equations-IV

CHEMICAL REACTIONS AND EQUATIONS- IV

Check your learning

                 

1.     Why a silver article generally turns black when kept in the open for few days?
2.     Give one example each of:
a)    Thermal decomposition reaction
b)    Electrolytic decomposition reaction
c)     Photo decomposition reaction
3.     Why does a wall not immediately acquire a white colour when a coating of slaked lime is applied on it?
4.     What is a role of oxidising agent in a reaction?
5.     Name a reducing agent that can be used to obtain manganese from manganese dioxide. Write balanced chemical equation for the reaction.
6.     Solid calcium oxide was taken in a container and water was added slowly to it-
a)    State two observations made in experiment.
b)    Write name and the chemical formula of the product.
7.     Name a reducing agent that can be used to obtain manganese from manganese dioxide. Write balanced chemical equation for the reaction.
8.     A white salt upon heating decomposes to give brown fumes and a residue is left behind.
a)    Name the salt
b)    Write the equation for the decomposition reaction.
9.     How will you test whether the gas evolved in a reaction in hydrogen?
10.    Why does copper does not evolve hydrogen on reacting with dilute sulphuric acid?
11.     A green colour hydrated salt upon heating loses water of crystallisation and turns into anhydrous salt, which on further heating releases oxides of sulphur.
a)    Name the salt and write its formula
b)    Write the balanced chemical equation.
c)     Name the oxides of sulphur


Prepared by Ms. Priti Maan

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