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प्रश्न
Name two metals which are found in nature in the free state.
उत्तर
The metals at the bottom of the reactivity series are mostly found in free state. For example: gold, silver, and platinum.
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Name the method by which aluminium metal is extracted.
Define the terms gangue.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
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.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) 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:
In making ships
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the following:
The substance added to get rid of gangue in the extraction of metal.
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
Froth floatation process is generally used to concentrate ______ ores.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Electrical wires have a coating of an insulting material. The material, generally used is
