State reasons for the following:
(i) Electric wires are covered with rubber like material.
(ii)From dilute hydrochloric acid, zinc can liberate hydrogen gas but copper cannot.
(iii) Sulphide ore of a metal is first converted to its oxide to extract the metal from it.
Answers
ANSWER :
▶️(i) It is because rubber is an insulator and does not allow current to flow through it.
▶️(ii) Zinc is more reactive than hydrogen. Therefore, it can displace hydrogen from dilute HCl whereas copper cannot, because it is less reactive than hydrogen.
▶️(iii) It is because it is easier to reduce oxide ore as compared to sulphide ore.
Answer:
Reasons:
(i) Electric wires are covered with rubber like material.
Reason:
Electrical wires are covered with rubber because,Rubber is poor conductor of electricty. Rubber is an insulator of electricity so it not allow electricity and most electrical wire is covered in a rubber or plastic coating called insulation. The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
(ii)From dilute hydrochloric acid, zinc can liberate hydrogen gas but copper cannot.
Reason:
Zinc reacts with hydrochloric acid to liberate Hydrogen gas as it is more reactive than Hydrogen and hence, displace it. Copper is less reactive when compared to Hydrogen and hence cannot displace it. The same can be understood by looking at the activity series of metals.
(iii) Sulphide ore of a metal is first converted to its oxide to extract the metal from it.
Reason:
It is true that sulphide ores are converted to oxides prior to their extraction. It is so because extracting a metal from its oxide is easier than extracting it from its sulphide and carbonate ores. The process of conversion of sulphide to oxide ores is called roasting.
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