Question

Which of the following is a binary compound? K2SO4 Ni(OH)2 BaCO3 Mn2O7

Answer 1

The answer is either b or d .

Answer 2

Answer : The correct option is, (D) $Mn_2O_7$

Explanation :

Binary ionic compound : It is a type of compound that is made up of the ions of the two different elements in which one element is a metal and another element is a non-metal.  It is only made up of two elements.

From the given options, option (A) $Mn_2O_7$ is a binary ionic compound because in this compound Mn is a metal which combine with the an oxygen non-metal element.

While the other options are not a binary compound because it is made up of more than two elements.

Hence, the $Mn_2O_7$ is a binary ionic compound.