I) Answer the following( in one or two words)
1. What are the elements called which can neither fit with metals nor non metals?
2. Which of the following metals is the best conductor of heat and electricity?
Gold, Silver, Copper, Aluminum
3. Which property of metals makes them useful as ringing bells?
4. Arrange the following elements in order of increasing reactivity.
Sodium, Magnesium, Copper, Zinc, Aluminum
5. An oxide solution of which of the following elements will turn blue litmus red.
6. Which non-metal is used in making pencil lead?
7. Identify the most reactive and least reactive metal amongst the following
Aluminum, Potassium, Copper, zinc, Gold
8. State the nature of oxides of non-metals.
9. Give an example of neutral oxide .
10. Which non metal is kept under water and why?
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Answers
Answer:
1. metalloids
2. silver
3. sonorous
4. Copper<Zinc<Aluminium<Magnesium<Sodium.
5.oxide solution of non-metals turns blue litmus to red. For example carbon is non-metal. Its oxide carbon-dioxide will form carbonic acid with water. The solution turns blue litmus paper red.
6. Graphite
7. Metals and Non-metals. Identify the most reactive and the least reactive metal amongst the following: Al, K, Cu, Au. K is most reactive; and Au is least reactive.
8. The oxides formed by non-metals are acidic (OR) neutral in nature. Ex: Carbon reacts with Oxygen to form Carbon monoxide which is neutral oxide and also forms Carbon dioxide which is acidic in nature. Similarly Nitrogen reacts with Oxygen to form acidic and neutral oxides
9.Neutral oxides show neither basic nor acidic properties and hence do not form salts when reacted with acids or bases, e.g., carbon monoxide (CO); nitrous oxide (N2O); nitric oxide (NO), etc., are neutral oxides.
10. phosphorus
And melting point of phosphorus is very low which is around 440C that's why it easily catches fire in the atmospheric condition. -Due to above given points phosphorus is stored in water. Henc
Explanation:
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