Chapter 11 : Practical Work - Frank Solutions for Class 9 Chemistry ICSE

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Chapter 11 - Practical Work Excercise 170

Question 1
What is sublimation? Give two examples.
Solution 1
On heating certain solids they don't melt and directly get converted to their gaseous form, this process of direct conversion of solids to their gaseous form is called as sublimation. For ex: camphor and ammonium chloride undergo sublimation.
Question 2
What is decrepitation? Which salt decrepitate on heating?
Solution 2
Decrepitation is a process of breaking up of solid particles on heating, which makes a crackling sound. Lead nitrate decrepitate on heating.

Lead nitrate
Question 3
Give the colour of the following compounds:
(a) Zn(NO)3
(b) Cu(NO3)2
(c) CuSO4.5H2O
(d) CuSO4
(e) K2Cr2O7
(f) PbS
Solution 3
(a) Zn(NO)3        = white
(b) Cu(NO3)2      = blue
(c) CuSO4.5H2O  = blue
(d) CuSO4          = pale green
(e) K2Cr2O7       = orange
(f) PbS               = black
Question 4
How will you distinguish between:
(a) NH3 and Cl2
(b) CO2 and SO2
(c) H2S and SO2
(d) H2 and O2
Solution 4
Question 5
Differentiate between
(a) Hard water and soft water
(b) Temporary hardness and permanent hardness
(c) Soaps and detergents
Solution 5
Question 6
(a) What chemical test you can perform in laboratory to verify that given piece of metal is zinc not copper?
(b) Give a chemical test to distinguish between Na2S and Na2Co3.
(c) How will you perform a flame test for sodium?
Solution 6
Question 7
Describe the effect of heat on the following, and also write equations for each.
(a) Copper carbonate
(b) Washing soda
(c) Lead nitrate
(d) Ammonium chloride
Solution 7
Question 8
Fill in the blanks:
(a) The gas with ______ smell is hydrogen sulphide.
(b) Smell of sulphur dioxide is like that of ______.
(c) A gas with irritating odour is ______.
(d) ______ turns red litmus paper blue.
(e) The formula of lime water is ______.
(f) The ______ colour is imparted to flame by potassium.
(g) The calcium imparts ______ colour to the flame.
Solution 8
(a) Rotten egg
(b) Burning sulphur
(c) Nitrogen dioxide
(d) Alkali
(e) Ca(OH)2
(f) Lilac
(g) Brick-red
Question 9
What do you understand by point and non point sources of water pollution?
Solution 9
Point sources of water pollution: Sources of water pollution that discharge directly into the water source are called as point sources of water pollution.
For ex: factories
Non point sources of water pollution: sources of water pollution that remain scattered and don't have specific locations for the discharge of pollutants into particular water bodies are called as non point sources of water pollution.
For ex: run off from fields.
Question 10
Give atleast three parameters which should be determined to test quality of water and also give their standards available.
Solution 10