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Questions
With the help of an appropriate example, justify that some of the chemical reactions are determined by Evolution of a gas.
Give chemical equation for the reaction involved in the above case.
Give one example of a chemical reaction characterised by evolution of a gas.
Solution
When zinc granules react with dilute sulphuric acid in a flask, hydrogen gas evolves and zinc sulphate solution is formed.
\[\ce{Zn(s) + H2SO4(aq)->ZnSO4(s) + H2(g)}\]
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RELATED QUESTIONS
Balance the given equation:
BaCI2 + H2SO4 
BaSO4 + HCI
What do you understand by exothermic reactions?
The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) potassium dichromate solution and sulphur dioxide
(b) potassium permanganate solution and sulphur dioxide
(c) potassium permanganate solution and lemon juice
(d) potassium dichromate solution and carbon dioxide.
Write symbolic representation for the following word equation and balance them :
Carbon + Oxygen → Carbon dioxide.
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\[\ce{CaH2_{(s)} + 2H2O_{( aq)}-> Ca(OH)2_{(s)} + 2H2_{(g)}}\]
Moles: 1 mole + ______ `→` ______ + ______
How is a flame test performed?
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Dilute hydrochloric acid to silver nitrate.
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Ca + H2O → Ca(OH)2 + H2
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Na2SO3 + HCl → 2NaCl + H2O + SO2
