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प्रश्न
Give a reason why a green deposit is seen on the surface of an article of copper
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उत्तर
The green deposit of the surface of the articles made of copper is seen due to the formation of green copper carbonate.
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संबंधित प्रश्न
State one use of Copper.
State one use of Silver.
State one use of Mercury.
Mention two uses of the following metals and non-metals
Aluminium
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
A metal with melting point less than 50°C is
Aluminium is not used to make :
Name a metal which is best conductor of electricity :
State two important uses of following metal:
Uses of gold
When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.
State the position of the following in the periodic table:
Halogens
What is it made from? Why?
Ornaments
With reference to the following metals state their use in daily life metal:
copper
Name the following:
A metal used in packaging.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Aluminium: _______: gold : : electric insulator
Give reasons for the following.
- Aluminum foils are used to wrap food items.
- Immersion rods for heating liquids are made up of metallic substances.
- Sodium and potassium are stored in kerosene.
- Mercury is used in thermometers.
Which of the following two combinations are correct?
| Metal | Gas Evolved | |
| (i) | Copper | Yes |
| (ii) | Iron | Yes |
| (iii) | Magnesium | No |
| (iv) | Zinc | Yes |
Why are bells made of metals?
Compare the conductivity of metals and non–metals.
