The element which shows only one oxidation state other than its elemental form is :

Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. $${\mathrm{Fe}}^{3+}$$ oxidises the iodide ion B. $${\mathrm{Fe}}^{3+}$$ oxidises the persulphate ion C. $${\mathrm{Fe}}^{2+}$$ reduces the iodide ion D. $${\mathrm{Fe}}^{2+}$$ reduces the persulphate ion Choose the most appropriate answer from the options given below:

The metal that shows highest and maximum number of oxidation state is :

While preparing crystals of Mohr's salt, dil $${\mathrm{H}}_2{\mathrm{SO}}_4$$ is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil $${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$$ is added here to :

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _________. $${\mathrm{Ti}}^{2+},{\mathrm{Cr}}^{2+}\text{ and }{\mathrm{V}}^{2+}$$

Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) $$\mathrm{Sc}$$ (B) $$\mathrm{Cr}$$ (C) $$\mathrm{V}$$ (D) $$\mathrm{Ti}$$ (E) $$\mathrm{Mn}$$ Choose the correct answer from the options given below :

The number of element from the following that do not belong to lanthanoids is $$\mathrm{Eu},\mathrm{Cm},\mathrm{Er},\mathrm{Tb},\mathrm{Yb}$$ and $$\mathrm{Lu}$$

Given below are two statements : Statement (I) : A $\pi$ bonding MO has lower electron density above and below the inter-nuclear axis. Statement (II) : The ${\pi }^{\ast }$ antibonding MO has a node between the nuclei. In the light of the above statements, choose the most appropriate answer from the options given below :

Select the compound from the following that will show intramolecular hydrogen bonding.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): ${\mathrm{PH}}_3$ has lower boiling point than ${\mathrm{NH}}_3$. Reason (R) : In liquid state ${\mathrm{NH}}_3$ molecules are associated through vander Waal's forces, but ${\mathrm{PH}}_3$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below :

Arrange the bonds in order of increasing ionic character in the molecules. $\mathrm{LiF}$, ${\mathrm{K}}_2\mathrm{O},{\mathrm{N}}_2,{\mathrm{SO}}_2$ and ${\mathrm{ClF}}_3$ :

Choose the polar molecule from the following:

Which of the following is least ionic?

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals A. have the same energy B. have the minimum overlap C. have same symmetry about the molecular axis D. have different symmetry about the molecular axis Choose the most appropriate from the options given below:

The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is

Given below are two statements: Statement - I: Since Fluorine is more electronegative than nitrogen, the net dipole moment of $${\mathrm{NF}}_3$$ is greater than $${\mathrm{NH}}_3$$. Statement - II: In $${\mathrm{NH}}_3$$, the orbital dipole due to lone pair and the dipole moment of $$\mathrm{NH}$$ bonds are in opposite direction, but in $${\mathrm{NF}}_3$$ the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction. In the light of the above statements, choose the most appropriate from the options given below:

The molecule / ion with square pyramidal shape is

Aluminium chloride in acidified aqueous solution forms an ion having geometry

Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-baqh{text-align:center;vertical-align:top} .tg .tg-amwm{font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List I Molecule List II Shape (A) $$\mathrm{Br}{\mathrm{F}}_5$$ (I) T-Shape (B) $${\mathrm{H}}_2\mathrm{O}$$ (II) See saw (C) $$\mathrm{Cl}{\mathrm{F}}_3$$ (III) Bent (D) $$\mathrm{S}{\mathrm{F}}_4$$ (IV) Square pyramidal Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : There is a considerable increase in covalent radius from $$\mathrm{N}$$ to $$\mathrm{P}$$. However from As to Bi only a small increase in covalent radius is observed. Reason (R) : Covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below: