NEET UG 2005 — Inorganic Chemistry

Which of the following molecules has trigonal planar geometry?

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

The correct order in which the $\mathrm{O}-\mathrm{O}$ bond length increases in the following is:

What is the correct relationship between the $\mathrm{pHs}$ of isomolars solution of sodium oxide $\left(\mathrm{pH}_1\right)$, sodium sulphide $\left(\mathrm{pH}_2\right)$, sodium selenide $\left(\mathrm{pH}_3\right)$ and sodium telluruide $\left(\mathrm{pH}_4\right)$ ?

Four successive members of the first two transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

Which of the following is the electron deficient molecule?

Which one of the following is expected to exhibit optical isomerism? $(\mathrm{en}=$ ethylenediamine)

The correct order of acid strength is:

The aqueous solution containing which one of the following ions will be colourless? (Atomic number : $\mathrm{Sc}=21, \mathrm{Fe}=26, \mathrm{Ti}=$ $22, \mathrm{Mn}=25$)

The correct sequence of increasing covalent character is represented by:

Which of the following oxides is expected to exhibit paramagnetic behaviour?

Which of the following would have a permanent dipole moment?

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (Atomic number : $\mathrm{Zn}=30, \mathrm{Cr}=24$, $\mathrm{Co}$ $=27, \mathrm{Ni}=28$ )

The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is: