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प्रश्न
Name the following:
A steel grey coloured solid non-metal.
उत्तर
Selenium
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संबंधित प्रश्न
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Compare the process of calcination and roasting.
How many valence electrons are present in non- metals?
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
