Q. 35.0( 1 Vote )

The experiments conducted by two students are given below.

Experiment - 1

2 mL of sodium thiosulphate solution is taken in a test tube, heated and to it, 2 mL of HCl solution is added.

Experiment - 2

2 mL of sodium thiosulphate solution is taken in a test tube and to it, 2 mL of HCl solution is added.

a) In which experiment is the precipitate formed first? Justify your answer.

b) Write the balanced equation for the reaction.

Answer :

a) The precipitate will form first in experiment-1 because of increasing the temperature the energy as well as the speed of molecules increases. As a result of the number of molecules undergoing effective collisions increases. So the reactant molecules will react more easily. Hence the rate of reaction will increase.

b) Na2S2O3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + SO2(g) + S(s)


Note- In balanced equation, the number of atoms of an element will be same on both side of reaction.


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