Chemistry
Assertion (A): Bronze is used in making medals, statues, etc.
Reason (R): Bronze is hard and easily cast.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Metallurgy
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — Bronze is composed of copper (80%), tin (18%) and zinc (2%). It is used in making medals, statues, utensils, etc. Hence, assertion (A) is true.
Bronze is used in making of medals, statues, utensils, bearing and coins because of its hardness and it can be casted easily. Hence, reason (R) is true and it is the correct explanation of assertion (A).
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Related Questions
Assertion (A): Aluminium is obtained from its oxide by electrolysis.
Reason (R): Aluminium has a great affinity towards oxygen so common reducing agents are not able to reduce it.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
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Assertion (A): For electrical heating devices like electric iron and heater, alloys are used.
Reason (R): Alloys have a greater resistance and low melting point.
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Name the following:
(a) A metal which is found abundantly in the Earth's crust.
(b) The process used for the enrichment of sulphide ore.
(c) A metal present in cryolite other than sodium.
(d) A metal which is unaffected by dilute or concentrated acids.
(e) A metal present in period 3, group 1 of the periodic table.
(f) The property possessed by metals by which they can be beaten into sheets.
(g) A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminium.
(h) The ore of zinc containing its sulphide.
(i) The solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
(j) The compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
Choose the most appropriate answer from the following list of oxides which fit the description. Each answer may be used only once:
[SO2, SiO2, Al2O3, MgO, CO, Na2O](i) A basic oxide
(ii) An oxide which dissolves in water forming an acid
(iii) An amphoteric oxide.
(iv) A covalent oxide of a metalloid