Which metal does not give the following reaction $M +$ water or steam $ \to $oxide $ + H$ $\downarrow$
Mercury
Iron
Sodium
Magnesium
For the ions $Zn ^{2+}, \,Ni ^{2+}$ and $Cr ^{3+}$ which among the following statements is correct ?
(Atomic number of $Zn =30,\,Ni =28$ and $Cr =24$ )
Which one of the following statements shows the correct percentage of carbon in steel, pig iron and wrought iron
Which of the following pair of ions may exhibit same colour
One of the constituent of german silver is
Which of the following statements is incorrect?