Related Questions

If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
ক 17 : 43
খ 13 : 42
গ 19 : 43
ঘ 15 : 42
If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
ক 13 : 42
খ 19 : 43
গ 15 : 42
ঘ 17 : 43
Fill up the blank with the correct one; 'Iron is________ useful  metal'
ক an
খ a
গ of
ঘ the
The metal used to recover copper from a solution of copper sulphate is
ক Na
খ Ag
গ Hg
ঘ Fe
An ore contains 26% of copper . To get 91 kgs of copper the quantity of are required is -
ক 350 kg
খ 240 kg
গ 340 kg
ঘ None of these
Australia imports, no copper in Australia equals 85% of the amount of copper produced by the private industry's use of produced by the country's mines each year. If the information above is true.which of the following conclusions can most reliably be drawn?
ক Australia imports copper ore from other countries.
খ SOme copper in Australia is recycled.
গ Asutralia 's industry wasters substantial amounts of copper.
ঘ Each year, Austria produces more copper than the previous year.
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is
ক Approximately equal to one
খ Less than one
গ Great than one
ঘ Cannot be found
Which of the following metals can displace copper from copper sulphate solution ?
ক Platinum
খ Mercury
গ Iron
ঘ Gold
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
ক Copper at cathode and oxygen at anode
খ Copper at anode and oxygen at cathode.
গ Copper at cathode and anodes dissolve to give copper
ঘ Hydrogen at cathode and oxygen at anode
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
ক Cheap electricity is available
খ The precious metal content of copper is high
গ There is a demand for ultrapure (99.99%) electrolytic copper
ঘ All of the above

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