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प्रश्न
Gold and silver are used to make jewellery. Give reason
उत्तर
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संबंधित प्रश्न
Give an example of a metal which is a poor conductor of heat.
One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
Write a balanced chemical equation for the reaction of zinc with potassium hydroxide solution.
Which property of copper and aluminium makes them suitable for making cooking utensils and boilers?
Which property of copper and aluminium makes them suitable for making electric wires?
What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?
Name two physical properties of sodium in which it's behaviour is not as expected from it's classification as metal.
Name a metal which is so soft that it can be cut with a knife.
Define non-metals. Give five examples of non-metals.
State three reasons (of which at least one must be chemical) for believing that sodium is a metal.
Name the metals present in the following alloys
Brass
Match the statements in Column A, with those in Column B .
| Column A | Column B | ||
| 1 | A metal used for making high quality mirrors . | a | Chlorine |
| 2 | A metal which neither malleable nor ductile. | b | Graphite |
| 3 | A non-metal,used in the sterilsation of water. | c | Iodine |
| 4 | A non-metal, whose deficiency can lead to disease like goitre. | d | Silver |
| 5 | A non -metal which can be used as dry lubricant. | e | Zinc |
State two important uses of following non-metals
Uses of nitrogen
Name:
a metal which can float on water
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Neutral oxide ……………..
Name:
a non metal which can form a positive ion
How many valence electrons are present in:
(ii) non-metals?
Write scientific reason.
The stainless steel vessels in Kitchen have copper coating on the bottom.
Distinguish between:
Metals - Nonmetals (physical characteristics)
The metal is stored in kerosene ______.
