The correct order of increasing field strength of ligands is:

1. ${\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{F}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{CN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-}$

2. ${\mathrm{F}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{CN}}^{-}$

3. ${\mathrm{CN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{F}}^{-}$

4. ${\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{F}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{CN}}^{-}$

Compound of sulphur that has $-\mathrm{O}-\mathrm{O}-\hspace{0.17em}$linkage among the following is:

1. ${\mathrm{H}}_2{\mathrm{SO}}_4,$ $\mathrm{sulphuric}$ $\mathrm{acid}$

2. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8,$ $\mathrm{peroxodisulphuric}$ $\mathrm{acid}$

3. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7,$ $\mathrm{pyrosulphuric}$ $\mathrm{acid}$

4. ${\mathrm{H}}_2{\mathrm{SO}}_3,$ $\mathrm{sulphurous}$ $\mathrm{acid}$

On electrolysis of dilute sulphuric acid using Platinum (Pt) electrode, the product obtained at the anode will be:

1. Oxygen gas

2. ${\mathrm{H}}_2\mathrm{S}$ gas

3. ${\mathrm{SO}}_2$ gas

4. Hydrogen gas 

Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue colour solution C is formed. What is the formula of C from the following?

Paper chromatography is an example of:

1. Partition chromatography

2. Thin layer chromatography

3. Column chromatography

4. Adsorption chromatography

Which of the following metal ions activates many enzymes participating in the oxidation of glucose to produce ATP and with Na it is also responsible for the transmission of nerve signals:

1. Copper

2. Calcium

3. Potassium

4. Iron

The correct option for free expansion of an ideal gas under adiabatic condition is:

1.  $q=0,$ $∆T<0$ and $w>0$

2.  $q<0,$ $∆T=0$ and $w=0$

3.  $q>0,$ $∆T>0$ and $w>0$

4.  $q=0,$ $∆T=0$ and $w=0$

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because-

1. + R effect of ${CH}_3$ groups 

2. $-$R effect of $-$ CH₃  groups 

3. Hyperconjugation 

4. $-$l effect of $-$CH₃ groups 

A molecule that cannot exist is:

The calculated spin-only magnetic moment of Cr²⁺ ion is: