NEET UG 2005 — Inorganic Chemistry

The correct order of acid strength is:

The correct sequence of increasing covalent character is represented by:

The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids 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 $\left(\mathrm{pH}_4\right)$ ?

Which of the following is the electron deficient molecule?

Which of the following molecules has trigonal planar geometry?

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

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

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