Which of the following elements exhibits a constant valency?

  • A
    $H$
  • B
    $Na$
  • C
    $Fe$
  • D
    $O$

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Choose the incorrect formula out of the four compounds for an element $X$ below.

Carbon has a valency of $2$ in $CO$ and $4$ in $CO_2$ and $CH_4$. Its valency in acetylene $(C_2H_2)$ is

Which of the following elements exhibits the lowest oxidation state in its compounds?

The lowest oxidation number of an atom $B$ in a compound $A_2 B$ is $-2$. The number of electrons in its valence shell is:

Mark the element which shows only one oxidation state.

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