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प्रश्न
Name two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.
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उत्तर
Potassium and sodium oxides cannot be reduced by carbon, carbon monoxide and hydrogen.
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संबंधित प्रश्न
How is the following metallic oxide reduced? Write the equation:
Zinc oxide
Give equation for the following conversion: Aluminium to aluminium nitride.
Give equation for the following conversion:Aluminium to sodium aluminate.
Name a non-metallic element which has a metallic lustre
Name a non-metallic element which is a conductor of electricity.
With reference to the reduction of copper (II) oxide , iron (II) oxide, lead (II) oxide and magnesium oxide; place the oxides in order of increasing ease of reduction.[i.e. first write the oxide that is most difficult to reduce and at last, the oxide, that is most easily reduced.]
Name the following :
A metal oxide that can be reduced by hydrogen
- 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
- Fill in the blanks using the most appropriate words from A to F.
- The ore from which aluminium is extracted must first be treated with ………………. so that pure aluminium oxide can be obtained.
- Pure aluminium oxide is dissolved in ….. to make a conducting solution.
iii. Write the formula of cryolite.
Give the equations for the reduction of copper oxide.
The following sketch represents the electroplating of an Iron cup with Nickel metal.
Study the diagram and answer the following questions:
- During electroplating, the iron cup is placed at the cathode. Why?
- Name the ion that must be present in the electrolyte.
- State one condition that is necessary to ensure that the deposit is smooth, firm and even.
- Write the reaction taking place at the cathode.
- What change would you observe at the anode?
