Question

The first element of group different form its congeners, i.e. other members of the group in many ways. These differences may be due to the following:
i. Small size of atom and ion.
ii. High electronegativity.
iii. Non-availibility of low lying d-orbitals.
The first element of a group shows resemblence with the second element of the adjacent group on the right. This is known as diagonal relationship.
On heating which of the following gives `NO_(2)` ?
A. `NaNO_(3)`
B. `LiNO_(3)`
C. `NH_(4)NO_(3)`
D. `NH_(4)NO_(2)`

Answer 1

Correct Answer - B
`4LiNO_(3) overset(Delta)rarr 2Li_(2)O+4NO_(2)+O_(2)`
`LiNO_(3)` is unstable and on heating decomposes to form stable `Li_(2)` and `NO_(2)`. Because of compared to `LiNO_(3)`.