Chemistry NCERT Exemplar Solutions Class 11th Chapter Ten

$3\mathrm{g}$ of acetic acid is added to $250\mathrm{m}\mathrm{L}$ of $0.1\mathrm{M}\mathrm{H}\mathrm{C}\mathrm{l}$ and the solution made up to $500\mathrm{m}\mathrm{L}$ . To $20\mathrm{m}\mathrm{L}$ of this solution $1/2\mathrm{m}\mathrm{L}$ of $5\mathrm{M}\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ is added. The $\mathrm{p}\mathrm{H}$  of the solution is

[Given: ${\mathrm{p}\mathrm{K}}_{\mathrm{a}}$ of acetic acid $=4.75$ , molar mass of acetic acid $=60\mathrm{g}/\mathrm{m}\mathrm{o}\mathrm{l},\mathrm{l}\mathrm{o}\mathrm{g}?3=0.4771$  ] Neglect any changes in volume.

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 ${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4=98\mathrm{g}/\mathrm{m}\mathrm{o}\mathrm{l}$  )                 

The standard heat of formation $\left({\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}_{298}^0\right)$ of ethane (in $\mathrm{k}\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}$ ), if the heat of combustion of ethane, hydrogen and graphite are $-1560,-393.5$ and $-286\mathrm{k}\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}$  respectively 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 $\left(A\right),\left(B\right)$ 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

The ammonia $\left({\mathrm{N}\mathrm{H}}_3\right)$ released on quantitative reaction of $0.6\mathrm{g}$ urea $\left({\mathrm{N}\mathrm{H}}_2{\mathrm{C}\mathrm{O}\mathrm{N}\mathrm{H}}_2\right)$ with sodium hydroxide $\left(\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}\right)$  can be neutralized by

Among statements (a) - (d), the correct ones are
(a) decomposition of hydrogen peroxide gives dioxygen.
(b) like hydrogen peroxide, compounds such as ${\mathrm{K}\mathrm{C}\mathrm{l}\mathrm{O}}_3,\mathrm{P}\mathrm{b}{\left({\mathrm{N}\mathrm{O}}_3\right)}_2$ and ${\mathrm{N}\mathrm{a}\mathrm{N}\mathrm{O}}_3$  when heated liberated dioxygen.
(c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide
(d) Hydrogen peroxide is used for the manufacture of sodium perborate

The correct order of stability for the following alkoxides is