Question

How can you show with the help of experiment:
1)Sodium chloride solution is a good conductor of electricity,
2)Iron is more reactive than copper.
3)Exhaled air contains carbon dioxide.​

Answer all

Answer 1

$\sf \huge\boxed{Answer}$

1)Sodium chloride solution is a good conductor of electricity,

To prove this, we need:-

• An Jug
• Brine Solution or salt solution
• Electrodes
• Battery

What we need to do is, insert the electrodes in the Brine solution and then, we will see the electrolysis of NaCl. This will be Na+ and Cl- ions. This shows they are good conductors.

2)Iron is more reactive than copper.

Carrying out an experiment with

• Iron Nail
• Copper Sulphate

$\sf Fe+CuSO_4 \rightarrow FeSO_4+Cu$

Copper gets displaced and FeSO4 is formed. This shows Iron is reactive than Copper.

3)Exhaled air contains carbon dioxide.​

For this, we need:-

• Lime water
• A container

Taking a pichkari, we can fill in the air exhaled by us in Lime water. We will observe formation of white precipicate ie $\sf CaCO_3+H_2O$ which only occurs in presence of Carbon dioxide. Hence, exhaled air contains Carbon Dioxide.

Answer 2

Answer:

1. What we need to do is, insert the electrodes in the Brine solution and then, we will see the electrolysis of NaCl. This will be Na+ and Cl- ions. This shows they are good conductors.
2. Take some Iron fillings and dip them in the Copper sulphate solution. After some time you will notice that there is a colour change in the solution which is caused due to the displacement of Copper from it solution. This shows that Iron is more reactive than Copper.
3. Place a straw inside it. Then take a deep breath and blow gently into the straw. The limewater turns milky. This goes to show that the carbon dioxide present in the exhaled air turns the limewater chalky.

Step-by-step explanation:

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