Advertisements
Advertisements
प्रश्न
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Advertisements
उत्तर
Zinc oxide is reduced to zinc by heating it with carbon.
\[\ce{\underset{\text{Zinc oxide}}{ZnO_{(s)}} + \underset{\text{Carbon}}{C_{(s)}} ->[Heat] \underset{\text{Zinc}}{Zn_{(s)}} + \underset{\text{Carbon monoxide}}{CO↑}}\]
APPEARS IN
संबंधित प्रश्न
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Name one metal which is extracted by electrolytic reduction.
Give the name and chemical formula of one ore of copper.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name the gas evolved when cinnabar ore is roasted.
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
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.
Give the principles of electromagnetic separation.
Explain the following:
Galvanization protects iron from rusting.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
In electrolytic reduction of alumina _______ is used as a cathode.
Find the odd one out and give its explanation.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
Electrical wires have a coating of an insulting material. The material, generally used is
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
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.
