Advertisements
Advertisements
Question
Gold and silver are active metals.
Options
Right
Wrong
Solution
Gold and silver are active metals- Wrong
APPEARS IN
RELATED QUESTIONS
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
State three objectives achieved during the roasting of ores.
Give the principles of the froth floatation process.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Define the term : Slag
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
What is the difference between calcination and roasting?
Name the process used for the enrichment of sulphide ore.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Find the odd one out and give its explanation.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the concept of Roasting.
Explain the reactions of nonmetals with water with the help of examples.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
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 a reason why Aluminium is preferably used in thermite reactions.
