Frank ICSE Solutions for Class 9 Chemistry – Practical Work

Frank ICSE Solutions for Class 9 Chemistry – Practical Work

PAGE NO :170

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.

Solution 2:

Decrepitation is a process of breaking up of solid particles on heating, which makes a crackling sound. Lead nitrate decrepitate on heating.

Frank ICSE Solutions for Class 9 Chemistry - Practical Work 6

Lead nitrate

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

Solution 4:

Frank ICSE Solutions for Class 9 Chemistry - Practical Work 1

Solution 5:

Frank ICSE Solutions for Class 9 Chemistry - Practical Work 2

Solution 6:

Frank ICSE Solutions for Class 9 Chemistry - Practical Work 3

Solution 7:

Frank ICSE Solutions for Class 9 Chemistry - Practical Work 4

Solution 8:

(a) Rotten egg

(b) Burning sulphur

(c) Nitrogen dioxide

(d) Alkali

(e) Ca(OH)2

(f) Lilac

(g) Brick-red

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.

Solution 10:

Frank ICSE Solutions for Class 9 Chemistry - Practical Work 5

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