(Atomic masses of $\mathrm{Ag}$ and $\mathrm{Cl}$ are $107.87$ and $35.5$ respectively)
$\Rightarrow \text { mass of chlorine }=\mathrm{n}_{\mathrm{Cl} } \times 35.5=0.0953\, \mathrm{gm}$
$\Rightarrow\, \% \text { wt of chlorine }=\frac{0.0953}{0.5} \times 100$
$\quad=19.06\, \%$
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The number of following statements which is/are correct about phenolphthalein is $.....$.
$A$. It can be used as an indicator for the titration of weak acid with weak base.
$B$. It begins to change colour at $pH =8.4$
$C$. It is a weak organic base
$D$. It is colourless in acidic medium
Which of the following options has the correct combination considering $List-I$ and $List-II$?
| $List-I$ | $List-II$ |
| $(I)$ Radius of the $n^{\text {th }}$ orbit | $(P)$ $\propto n ^{-2}$ |
| $(II)$ Angular momentum of the electron in the $n^{\text {th }}$ orbit | $(Q)$ $\propto n ^{-1}$ |
| $(III)$ Kinetic energy of the electron in the $n^{\text {th }}$ orbit | $(R)$ $\propto n ^0$ |
| $(IV)$ Potential energy of the electron in the $n^{\text {th }}$ orbit | $(S)$ $\propto n ^1$ |
| $(T)$ $\propto n ^2$ | |
| $(U)$ $\propto n ^{1 / 2}$ |
($1$) Which of the following options has the correct combination considering $List-I$ and $List-II$?
$(1) (II), (R)$ $(2) (I), (P)$ $(3) (I), (T)$ $(4) (II), (Q)$
($2$) Which of the following options has the correct combination considering $List-I$ and $List-II$?
$(1) (III), (S)$ $(2) (IV), (Q)$ $(3) (IV),(U)$ $(4) (III), (P)$
Give the answer or quetion ($1$) and ($2$)