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प्रश्न
What is an amalgam? Name one metal which does not form amalgam? State one use of amalgam.
उत्तर
Amalgam:
A mixture or an alloy of mercury with a number of metals or non-metals is known as amalgams. An amalgam may be liquid such as Na/Hg or a solid like Zn/Hg.
Iron does not form amalgam.
Dental amalgam which is a mixture of mercury with a silver tin alloy is used for dental fillings.
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संबंधित प्रश्न
Choose the correct answer from the options given below:
Aluminum powder is used in thermite welding because
A. It is a strong reducing agent
B. It is a strong oxidizing agent
C. It is corrosion resistant
D. It is a good conductor of heat
Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore.
Write the equation for the formation of aluminium at the cathode during the electrolysis of alumina.
Explain
A neutral gas other than oxygen which is formed at the anode during electrolysis of fused alumina
Name an alloy of copper in electrical appliances or household vessels.
State amalgam use with an example.
Explain the following:
Stainless steel is more useful than steel.
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Write down the three letters each from the above list which are relevant to:
- Zinc
- Aluminium
Find the odd one out of the following and explain your choice.
Sulphur, Phosphorous, Carbon, Iodine
The common method of the extraction of metal from the oxide ore is:-
