Give the others form of iron ore.
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why helium does not react with other elements?
What s the difference between hard and soft coal ?
What is soot or lamp black ?
What are the names of the three different rays emitted by radioactive substances ?
Difference between Physical and Chemical change ?
What is specific conductivity?
Explain substituted hydrocarbon?
What is modern definition(iupac) of ph?
What are the factors that affect the viscosity of a liquid?
Why mud houses are cooler in summer and warmer in winter ?
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How is measurement of ph made?