Q-1 How will you test wheather the gas evolved in a reaction is hydrogen?
Q-2 The smell and taste of food containing fats and oils changes after sometime. Why does this happen? Name the process.
Q-3 What do you mean by a precipitation reaction? Explain by giving examples.
Q-4 Explain giving chemical equation any two uses of chemical decomposition reaction in industry.
Q-5 What do you mean by balanced and unbalanced chemical equation?
Q-6 Which solution of a substance is used for whitewashing.
Q-7 Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Q-8 What is universal indicator ?
Q-9 What does one mean by exothermic and endothermic reaction? Give examples.
Q-10 Why should a magnesium ribbon be cleaned before burning in air ?
Q-11 Why is respiration considered an exothermic reaction? Explain.
Q-12 Why do we apply paint on iron articles?
Q-13 What is different between combination and decomposition reaction?
Q-14 What is difference between oxidation and oxidising agent?
Q-15 Difference between displacement and double displacement reaction?
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