During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table 4.1 below. Help them in filling the table.
Name of the materialAppearance(Hard/Soft)Transparency(Transparent/Translucent/Opaque)Floats/ Sinks in waterSoluble/ Insoluble in water

AcademicChemistryNCERTClass 6

Name of the material






Floats/ Sinks in water Soluble/ Insoluble in water
 Lump of salt Hard Opaque Sinks Soluble
Green grass Soft Opaque  Floats  Insoluble
glass piece
Hard TransparentSinksInsoluble
Therm- ocol box Soft Opaque Floats Insoluble
Pen Hard Opaque Floats Insoluble
Iron nail Hard Opaque Sinks Insoluble
Hard Transparent Sinks Insoluble
Hair Hard Opaque Floats Insoluble
Hard Opaque Floats Insoluble
 A piece of sugar candy Hard Opaque Sinks


 [Extra information:

Transparency: Transparency (or transmission of visible light) is characterized by light transmittance, i.e. the measured percentage of incident light transmitted through a standardized plastic specimen. The higher the transmittance %, the higher the transparency. There are three types of transparency:

Transparent Objects: If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. For example water, clear glass, etc.

Opaque Objects: If we cannot see through an object at all, it is an opaque object. For example a wooden door, wall, etc.

Translucent Objects: There are some objects through which we can see, but not very clearly. Such objects are known as translucent. For example Butter paper, ground glass, etc


Updated on 10-Oct-2022 13:19:57