1. 20 carat gold is a mixture of 20 parts by weight of gold and 4 pats by weight of copper. Pure gold is 24 carat.
2. Iodized salt used as table salt is a mixture of NaCl and a small amount of NaI.
3. Cement is a mixture of number of silicates.
4. The existence of an element in two or more chemically similar but physically different forms is called allotropy and the different forms are called allotropes e.g., diamond, grphite, wood charcoal, lamp black etc., are allotropes of carbon.
5. The existence of a compound in different crystalline forms is called polymorphism and the different forms are called polymorphs, e.g., ZnS has two polymorphs called zinc blende and wurtzite.
6. Substances which absorb moisture from air are called hygroscopic substances e.g., anhydrous CuSO4, quicklime etc.
2. Iodized salt used as table salt is a mixture of NaCl and a small amount of NaI.
3. Cement is a mixture of number of silicates.
4. The existence of an element in two or more chemically similar but physically different forms is called allotropy and the different forms are called allotropes e.g., diamond, grphite, wood charcoal, lamp black etc., are allotropes of carbon.
5. The existence of a compound in different crystalline forms is called polymorphism and the different forms are called polymorphs, e.g., ZnS has two polymorphs called zinc blende and wurtzite.
6. Substances which absorb moisture from air are called hygroscopic substances e.g., anhydrous CuSO4, quicklime etc.
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