Chemistry

The number of bonds between sulphur and oxygen atoms in ${\mathrm{S}}_2{\mathrm{O}}_8^{-}$ ${}_{}{}_{}^{}$ and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :

For the Balmer series in the spectrum of $$ $\mathrm{H}$ atom, $\bar{v}={\mathrm{R}}_{\mathrm{H}}\left\{\frac{1}{{\mathrm{n}}_1^2}-\frac{1}{{\mathrm{n}}_2^2}\right\}$ $\stackrel{}{}{}_{}\left\{\frac{}{{}_{}^{}}\frac{}{{}_{}^{}}\right\}$ the correct statements among (I) to (IV) are :

(I) As wavelength decreases, the lines in the series converge

(II) The integer $\mathrm{n}1$ $$ is equal to 2

(III) The lines of longest wavelength corresponds to $n_2=3$ ${}_{}$

(IV) The ionization energy of hydrogen can be calculated from wave number of these lines

The strength of an aqueous $$ $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ solution is most accurately determined by titrating : (Note : consider that an appropriate indicator is used)

The rate of a certain biochemical reaction at physiological temperature (T) occurs ${10}^6$ ${}^{}$ times faster with enzyme than without. The change in the activation energy upon adding enzyme is :

The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively:

The major product of the following reaction is :

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at ${}^{}$ $63{}^{?}\mathrm{C}$ while the other boils at ${60}^{?}\mathrm{C}$ ${}^{}$ . What is the best way to separate the two liquids and which one will be distilled out first?

The predominant intermolecular forces present in ethyl acetate, a liquid, are:

The most suitable reagent for the given conversion is :

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :