Explanation
Which of the following is lustrous?
Different objects look different from each other according to the material they are made from. The appearance depends on color, hardness, texture, and lustre. Metals are lustrous due to free electrons on their surfaces. Hence materials made of metals have lustre.
The material which does not allow light to pass through it is called opaque and material that allows light to pass through it is called transparent. The material through which light can pass partially is called translucent, e.g. butter paper.
Identify the odd one out.
Which of the following is translucent?
The material through which light can pass partially is called translucent, e.g. butter paper, thin curtain, tinted glass etc.
In general, organic compounds are insoluble in water. Though alcohol is an organic compound it is soluble in water due to hydrogen bonding.
Some substances like salt and sugar completely disappear when mixed with water. Thus, they are soluble in water.
Other substances like chalk powder do not mix with water or disappear. They are insoluble in water.
Some gases like oxygen also dissolve in water (soluble). This dissolved oxygen is important for the survival of many aquatic animals.
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