Which alloy is used for making coins?

  • A
    Brass
  • B
    Bronze
  • C
    German silver
  • D
    Nichrome

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In making gun-barrel,the steel used is

$K_2Cr_2O_7 \xrightarrow{\Delta} A + B + C$
If $B$ is a green-colored compound,then it would be:

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Write about the oxides and oxoanions of transition metals.

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Which oxide of $Mn$ is acidic in nature?

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