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प्रश्न
Gold and silver are active metals.
विकल्प
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Which metal is extracted from bauxite ore?
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Which metal can be extracted from the following ore?
Haematite
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Define the term:
Flux
How many valence electrons are present in metals ?
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Extraction of moderately reactive elements is done by _______ and _______ method.
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Write the molecular formulae of the following compound.
Cryolite
Explain the concept of Calcination.
Explain concept with example/explain with the help of a balanced equation.
Calcination
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
