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प्रश्न
Complete flow chart given below.
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उत्तर
संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Why does a new aluminium vessel lose shine so soon after use?
Name two metals which are found in nature mainly in the free state (as metallic elements).
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Which metal can be extracted from the following ore?
bauxite
Aluminum is used in thermite welding:
what is ignition mixture?
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
What is meant by concentration of ores?
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
What is the difference between calcination and roasting?
Write the name.
The process of extraction of aluminium from alumina-
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Gold and silver are active metals.
Write the molecular formulae of the following compound.
Cryolite
Care must be taken while diluting concentrated nitric acid with water. Why?
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.
