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Chemical Equation

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Question

Give one example each of which illustrates the following characteristics of a chemical reaction:

(a) Evolution of a gas
(b) Change of colour

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Solution

(a) When Zinc reacts with dil. sulphuric acid. Hydrogen gas is evolved, with an effervescence.
(b) When blue coloured copper sulphate solution reacts with hydrogen sulphide gas, a black coloured solid substance copper sulphide is formed.

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Similar questions

Give 1 example which illustrates the following characteristics of a chemical reaction

(I) evolution of gas

(II) change of colour

Q. Give one example each of a chemical reaction showing the following characteristics.

(a) evolution of a gas
(b) change of colour
(c) formation of precipitate
(d) change of state from liquid to gas
(e) change of state from gas to liquid

Q. (a) What is meant by chemical reaction? Explain with the help of an example.
(b) Give one example each of a chemical reaction characterised by:
(i) evolution of a gas
(ii) change in colour
(iii) formation of a precipitate
(iv) change in temperature
(v) change in state.

Q. Give an example of a chemical reaction for each of the following situations:

(a) A change in colour is observed.
(b) A gas is evolved.
(c) Sound is produced.

Q. Give one example each of a chemical reaction characterised by:
(a) evolution of a gas
(b) formation of a precipitate
(c) change in temperature
Write equations of the reactions which take place in each case.

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