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Introduction to Chemistry

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Question

An arrow pointing downwards in a chemical reaction shows

(a) evolution of gas
(b) formation of precipitae
(c) oxidation
(d) displacement

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Solution

(b) formation of precipitate
In a chemical reaction, an arrow pointing downwards shows the formation of a precipitate and an arrow pointing upwards shows the evolution of a gas.

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Similar questions

Q. An arrow pointing downwards in a chemical reaction shows

(a) evolution of gas
(b) formation of precipitae
(c) oxidation
(d) displacement

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.

The chemical reaction between quicklime and water is characterised by :
(a) evolution of hydrogen gas

(b) formation of slaked lime precipitate

(c) change in temperature of mixture

(d) change in colour of the product

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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