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प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
पर्याय
Right
Wrong
उत्तर
In the electrolytic method, a layer of highly active metal is applied to a less active metal- Wrong
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संबंधित प्रश्न
What iron compound is present in haematite ore? Also write its chemical formula.
What is the difference between a mineral and an ore?
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Give reasons, why aluminum is used in:
In making ships
Aluminum is used in thermite welding:
write reaction for process?
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Give the chemical formula of :
Cryolite
Which one of the following is not true of metal :
Metals are malleable and ductile
Define roasting.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Aluminium oxide is _______ oxide.
Find the odd one out and give its explanation.
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
