Class 12th

The number of ${\mathrm{s}\mathrm{p}}^2$ -hybridized carbons present in "Aspartame" is

The flocculation value of $\mathrm{H}\mathrm{C}\mathrm{l}$ for arsenic sulphide sol is $30\mathrm{m}\mathrm{m}\mathrm{o}\mathrm{l}{\mathrm{L}}^{-1}$ . If ${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4$ is used for the flocculation of arsenic sulphide, the amount, in grams of ${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4$ in $250\mathrm{m}\mathrm{L}$ required for the above purpose is (Molecular mass of ${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4=98\mathrm{g}/\mathrm{m}\mathrm{o}\mathrm{l}$  )                 

Consider the following reactions:

$\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}+{\mathrm{K}}_2{\mathrm{C}\mathrm{r}}_2{\mathrm{O}}_7+\underset{\text{(Conc.)}}{{\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4?\left(\mathrm{A}\right)+\text{side products}}$

(A) $+\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$
$\left(\mathrm{B}\right)+$ Side products
(B) $+{\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4+{\mathrm{H}}_2{\mathrm{O}}_2?($  dilute)
(C) + Side products

The sum of the total number of atoms in one molecule each of $\left(A\right),\left(B\right)$ and $\left(C\right)$  is         

Consider the following reactions:

$\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}+{\mathrm{K}}_2{\mathrm{C}\mathrm{r}}_2{\mathrm{O}}_7+\underset{\text{(Conc.)}}{{\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4?\left(\mathrm{A}\right)+\text{side products}}$

(A) $+\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$
$\left(\mathrm{B}\right)+$ Side products
(B) $+{\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4+{\mathrm{H}}_2{\mathrm{O}}_2?($  dilute)
(C) + Side products

The sum of the total number of atoms in one molecule each of  and  is         

Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non-volatile solute are together sealed in a container. Over time

A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is $$ $30\mathrm{c}\mathrm{m}$ and the refractive index of the lens material is 1.5 , then the focal length of the lens (in $\mathrm{c}\mathrm{m}$ $$ ) is(Ray Optics)

The correct order of stability for the following alkoxides is

A Chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (a) benzanilide, (b) aniline and (c) acetophenone. When the column is eluted with a mixture of solvents, hexane; ethyl acetate $(20:80)$ , the sequence of obtained compounds is

Among the statements $(a-d)$ , the incorrect ones are:

For the following reactions:

where,

${\mathrm{k}}_{\mathrm{s}}$ and ${\mathrm{k}}_{\mathrm{e}}$ are respectively, the rate constant for substitution and elimination, and $\mu =\frac{{\mathrm{k}}_{\mathrm{s}}}{{\mathrm{k}}_{\mathrm{e}}}$ , the correct option is