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.
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).
Related Questions
Assertion (A): Aluminium is obtained from its oxide by electrolysis (Hall-Heroult process).
Reason (R): Aluminium is generally not found in the form of aluminium oxide.
- 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.
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.
- 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.
Fill in the blanks :
(a) During the concentration of bauxite ore, aluminium goes in …………… (soluble/insoluble) part because of its …………… (acidic/basic/amphoteric) nature.
(b) In Hoope's process, pure aluminium is collected at the …………… (top/bottom) of the electrolytic cell.
(c) Usually …………… (sulphide/carbonate) ores are subjected to …………… (calcination/roasting) which is done in the absence of air
(d) Zinc blende is converted to oxide by …………… (roasting/calcination) process.
(e) Froth floatation process is generally used to concentrate …………… ores (sulphides/carbonate)
Given below in column A is a schematic diagram of the electrolytic reduction of alumina. Identify the parts labelled as A, B and C with the correct options from the Column B.
