What is"hydraulic washing" or "gravity separation"?explain with diagram
the galvanised article is protected against rusting even if zinc coating is broken
why are metals called electropositive elements whereas non-metals are called electronegative elements?
Hydrogen gas is not evolved when nitric acid reacts with metals but magnesium and manganese metals react with nitric acid to produce hydrogen gas,why??HOW?
difference between calcination and roasting
what are amphoteric oxides? give 2 examples
alloys are used in electrical heating device rather than pure metal .give two reasons for this statement ?
what is the nature of metal oxide and non metallic oxide? give reason
Most of the metals do not give hydrogen while reacting with nitric acid. Why ?
why tarnished copper vessels are cleaned with lime juice or tamarind
Explain with example - calcination and roasting
(i) Explain the steps for extraction of copper from its sulphide ore. Write the balanced equations involved in the process. (ii) What is meant by refining of metals ? Draw a diagram of electrolytic refining of copper and name the substances used as cathode, anode and the electrolyte.
what are the uses of metals and non -metals???????
Explain why conc. HNO3 can be stored in aluminium container
why are metals sulphide and carbonate converted into metal oxide prior to reduction during the extraction of metals . explain by giving one example in each case
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