The correct statements from the following are:
a) The total number of sigma bonds present in benzene is 12
b) \(\mathrm{LiF}\) is more covalent than \(\mathrm{KF}\)
c) \(\mathrm{SnCl}_2\) is more covalent than \(\mathrm{SnCl}_4\)

Which one of the following enzymes converts proteins into amino acids?

Identify the initiation step \(/ \mathrm{s}(\mathrm{X})\) and termination \(\mathrm{step} / \mathrm{s}(\mathrm{Y})\) of free radical chlorination of \(\mathrm{CH}_4\) from the following.
a) \(\dot{\mathrm{C}}_3+\dot{\mathrm{C}} \mathrm{l} \rightarrow \mathrm{CH}_3-\mathrm{Cl}\)
b) \(\dot{\mathrm{Cl}}+\dot{\mathrm{C}} l \rightarrow \mathrm{Cl}-\mathrm{Cl}\)
c) \(\dot{\mathrm{C}}_3+\mathrm{Cl}_2 \rightarrow \mathrm{CH}_3-\mathrm{Cl}+\dot{\mathrm{Cl}}\)
d) \(\mathrm{Cl}_2 \rightarrow 2 \dot{\mathrm{Cl}}\)
e) \(\mathrm{CH}_4+\dot{\mathrm{Cl}} \rightarrow \dot{\mathrm{C}} \mathrm{H}_3+\mathrm{HCl}\)
f) \(\mathrm{CH}_3+\dot{\mathrm{C}}_3 \rightarrow \mathrm{CH}_3-\mathrm{CH}_3\)

The carboxylic acid with highest \(\mathrm{pK}_{\mathrm{a}}\) and lowest \(\mathrm{pK}_{\mathrm{a}}\) values of the following respectively are

If \(\mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^0=-0.441 \mathrm{~V}\) and \(\mathrm{E}_{\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}}^0=0.771 \mathrm{~V}\), the standard emf of the cell reaction \(\mathrm{Fe}(\mathrm{s})+2 \mathrm{Fe}^{3+}(\mathrm{aq}) \longrightarrow 3 \mathrm{Fe}^{2+}(\mathrm{aq})\) is

Use the data from table to estimate the enthalpy of formation of \(\mathrm{CH}_3 \mathrm{CHO}\).

The magnetic property of \(\mathrm{NO}_2\) is

A carrier wave of peak voltage \(60 \mathrm{~V}\) is used to transmit a message signal. Then the peak voltage of the modulating signal in order to have a modulation index of \(90 \%\) is

\(\mathrm{A}(2,1,2), \mathrm{B}(1,0,0), C(1+\sqrt{3}, \sqrt{3},-\sqrt{6})\) are vertices of a triangle. If the length of the median drawn through \(\mathrm{A}\) is \(\lambda \sqrt{9-2 \sqrt{3}+2 \sqrt{6}}\) then \(\lambda=\)

Which of the following compounds do not have \(s p^3\) carbon atom \((s)\) ?

The least positive integer \(n\) for which \((1+i)^n=(1-i)^n\), is

If $\int \frac{\cos 4x+1}{\cot x-\tan x}=k\cos 4x+c$, then "$k$" is equal to

The area (in sq units) of the quadrilateral formed by two pairs of lines \(\lambda^2 x^2-m^2 y^2-n(\lambda x+m y)=0 \quad\) and \(\lambda^2 x^2-m^2 y^2+n(\lambda x+m y)=0\) is: