Q23 of 27 Page 1

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.


When a solution of sodium sulphate is added to a solution of barium chloride the following reaction takes place:



The barium sulphate formed precipitates at the bottom of the test tube in the form of a white precipitate.


The type of reaction taking place here is a double displacement reaction or precipitation reaction.


Observation: A white precipitate of BaSO4 is formed in the test tube.


More from this chapter

All 27 →
21

(a) State Fleming’s left hand rule.

(b) Write the principle of working of an electric motor.


(c) Explain the function of the following parts of an electric motor.


(i) Armature (ii) Brushes (iii) Split ring


 22

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.


 24

List the steps of preparation of temporary mount of a leaf peel to observe stomata.

 25

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

OR


A student is viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes.(in proper sequence)