Chemical Reactions
1)
A student added a few pieces of zinc into dil.H₂SO₄ taken in a test tube. Suddenly, evolution of gas occurs. What gas is evolved?

2)
Which product is formed when magnesium burns in air?

3)
Why do copper sulphate crystals change colour from blue to white on heating?

4)
While performing an experiment, a student adds sodium sulphate solution to a colourless solution. A white precipitate is immediately formed and is insoluble in dil. HCl. The colourless solution is …………………………… & the precipitate formed is……………………

5)
When will we observe a precipitate to occur in the solution?

6)
Barium sulphate is:

7)
What is observed when burning a magnesium ribbon in air?

8)
What happens when blue litmus is added to a water extract of MgO?

9)
Why does iron displace copper from its salt solution?

10)
Which diagram shows the safest method to detect hydrogen gas produced in a reaction?


  


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