Advertisements
Advertisements
प्रश्न
Gold and silver are active metals.
पर्याय
Right
Wrong
Advertisements
उत्तर
Gold and silver are active metals- Wrong
APPEARS IN
संबंधित प्रश्न
Define the Ore.
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
What iron compound is present in haematite ore? Also write its chemical formula.
Which metal is extracted from cinnabar ore?
Calamine ore can be used to extract one of the following metals. This metal is:
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
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.
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Froth floatation process is generally used to concentrate ______ ores.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Explain concept with example/explain with the help of a balanced equation.
Calcination
