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प्रश्न
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
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उत्तर
Sodium aluminate reacts with water to give aluminium hydroxide as a precipitate and sodium hydroxide.
\[\ce{\underset{\text{Sodium aluminate}}{NaAlO_{2(aq)}} + \underset{\text{Water}}{2H2O_{(l)}} -> \underset{\text{Sodium hydroxide}}{NaOH_{(aq)}} + \underset{\text{Aluminium hydroxide}}{Al(OH)_3↓}}\]
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संबंधित प्रश्न
Name one metal which is extracted by:
Reduction with heat alone.
Define the term ore.
What is meant by the ‘concentration of ore’?
Name the gas produced when calamine ore is calcined.
Name the metal which is extracted from the ore called ‘rock salt’.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Define the following term.
Gangue
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
How many valence electrons are present in metals ?
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Zinc blende is converted to oxide by ______ process.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Explain in brief types of extraction of highly reactive metals according to their reactivity.
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
