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Answers
Answer:
Explanation:1.
The 4th state of matter is called plasma. The state consists of super energetic and super excited particles. These particles are present in ionised form. The fluorosent and neon sign bulbs consists of plasma. The plasma glows with a special colour depending on the nature of gas. The sun and stars glow because of plasma in them. The plasma is created in stars because of high temperature.
2. Alloy is the homogeneous mixture of two or more metals or a metal and a non metal.
It is prepared by 1st melting the primary metal, and then dissolving the other elements in definite proportions. It is then cooled at room temperature.
Examples...
Stainless steel- nickel and chromium, it is hard and don't rust.
Brass- copper and zinc, used to make utensils.
Bronze- copper and tin, not good conductor of electricity but copper is used to make electrica circuits.
Solder- lead and tin , used for welding electrical wires together.