Question

TRUE OR FALSE
1. Solutions do not scatter light. They do not exhibit Tyndall effect
2. A metal like iron forms rust when exposed for a long time to oxygen and moisture in the air and in the presence of an acid.
3. The Characteristics of mixtures may be solid, liquid or gas.
4. Compounds are made up of one or more kind of elements
5. The sound ( and light ) indicates that a material is electrically conductive.

Answer 1

Answer:

1 FALSE

2 FALSE

3 TRUE

4 FALSE

5 TRUE

Answer 2

1. True
2. True
3. False
4. False
5. False

Explanation:

1. True solutions have particle size which is smaller than 1 nanometre and that isn't enough for scattering of sunlight. Light is often scattered when the particle size is more than wavelength of sunlight. So, true solutions are not able scatter light and hence there is no Tyndall effect.
2. Metals when kept open in presence of acids, it interacts with oxygen and water so as to corrode. Water in acid and air moisture acts as a catalyst while metal reacts with oxygen. Corrosion of iron is referred as rust.
3. Solids, liquids or gas do not seem to be characteristics of mixture. These are states of mixture. Mixtures possess physical or chemical characteristics.
4. Compounds contain of two or more than two kinds of elements. One type of atoms form elements. Compounds are formed when two or over two kind of atoms combine together by covalent or ionic bonding.
5. Sound may be a wave which needs medium to travel. Sound or light do not indicate anything about electrical conductivity of any material. Sound and particle nature of sunlight indicates presence of particles in that medium but it doesn't conclude whether the particles are insulators or conductors. Electrical conductivity requires free electrons and sound waves don't indicate that.