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Selina Solutions Class 9 Biology Solutions for Exercise in Chapter 6 - Seeds: Structure And Germination

Question 7 Exercise

In experiment No.5 we are using mercury in the test-tube and the beaker. Why can’t we use water instead?

Answer:

Mercury is used instead of water because of the following properties of mercury, namely:

 Mercury is a good conductor of heat and is the only metal that occurs in liquid state

 It sticks to the capillary walls and provides accurate results

 They can easily be obtained in its pure state

 It has a low specific heat.

Video transcript
"hello everyone welcome to little this is priya here we have an interesting question let us look into the question now in experiment number five we are using in the test tube and in the beaker why can't we use mercury so in the test tube vrt we are using mercury instead of water in the test tube as well as in beaker and these are the reasons why we are using the mercury in the test human beaker the first reason is mercury is a good conductor so mercury is a good conductor of heat make it is a good conductor of heat so that we are using mercury instead of water so being it is a good connector of heat and it is the only metal that can occurs in liquid state and the second reason is it sticks to the capillary walls and provides accurate results mercury can stick stick to them stick to the walls of once off test tube it sticks to the walls of the test tubes and use them gives you accurate result and the third reason they can easily be obtained in a pure state mercury can be it can be easily obtain a few state and the fourth reason is it has a low specific heat that means it requires very less temperature to get heated so these are the four reasons why we are using mercury instead of water the first reason is mercury is a good conductor and the second reason is it sticks to the walls of test tube and gives accurate results and third reason is it can be easily obtained in a pure state and the sec and the fourth reason is it has a low specific rate hope you understand this video if you like my video please subscribe to our little channel and if you have any doubts you can keep a message in comment box thank you"
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