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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
Name the following:
Main ore of aluminium.
Name the most abundant metal in the earth's crust.
Fill in the following blank with suitable word:
The non-metal present in steel is ............
Name the method by which aluminium metal is extracted.
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
Name the gas produced when calamine ore is calcined.
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
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.
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Which one of the following is not true of metal :
Metals are malleable and ductile
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Extraction of moderately reactive elements is done by _______ and _______ method.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the reactions of nonmetals with water with the help of examples.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
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.
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?
