MCQ
One energy difference between the states $n = 2$ and $n = 3$ is $E \,eV$ in hydrogen atom. The ionization potential of $H$ atom is ........... $\mathrm{E}$
- A$3.2$
- B$5.6$
- ✓$7.2$
- D$13.2$
✓
Answer
Correct option: C.
$7.2$
c
${E_3} - {E_2} = E(eV)$ or $\frac{{ - {E_1}}}{9} + \frac{{{E_1}}}{4} = E$
${E_3} - {E_2} = E(eV)$ or $\frac{{ - {E_1}}}{9} + \frac{{{E_1}}}{4} = E$
$\therefore $ ${E_1} = \frac{{36E}}{5} = 7.2\,E$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A solution of m-chloroaniline, $m-$chlorophenol and $\mathrm{m}$ -chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of $\mathrm{NaHCO}_{3}$ to give fraction $\mathrm{A}$. The left over organic phase was extracted with dilute $NaOH$ solution to give fraction $\mathrm{B}$. The final organic layer was labelled as fraction $\mathrm{C}$. Fractions $\mathrm{A},\mathrm{B}$ and $\mathrm{C},$ contain respectively
→Beryllium’s fourth electron will have the four quantum numbers :
Which of the following molecule contains asymmetric carbon atom
The $IUPAC$ name of compound
→$\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,} \\
{C{H_3} - C - CH - CH - CH - C{H_3}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,CHO\,\,}
\end{array}$
is :
Which of the following compounds on reaction with excess $CH_3MgBr$ and subsequent hydrolysis will give a tertiary alcohol?
→Product is:
Match $List-I$ with $List-II$.
→| $List-I$ | $List-II$ |
| $(A)$ $Cd ( s )+2 Ni ( OH )_{3}( s ) \rightarrow CdO ( s )+2 Ni ( OH )_{2}( s )+ H _{2} O (l)$ | $(I)$ Primary battery |
| $(B)$ $Zn ( Hg )+ HgO ( s ) \rightarrow ZnO ( s )+ Hg (l)$ | $(II)$ Discharging of secondary battery |
| $(C)$ $2 PbSO _{4}( s )+2 H _{2} O (l) \rightarrow Pb ( s )+ PbO _{2}( s )+ 2 H _{2} SO _{4}( aq )$ | $(III)$ Fuel cell |
| $(D)$ $2 H _{2}( g )+ O _{2}( g ) \quad \rightarrow 2 H _{2} O (l)$ | $(IV)$ Charging of secondary battery |
Choose the correct answer from the options given below.
Decolourization of alkaline $KMn{O_4}$ is used as a test for
→The dissociation equilibrium of a gas $AB_2$ can be represented as :
→$2AB_{2(g)} \rightleftharpoons 2AB_{(g)} + B_{2(g)}$
The degree of dissociation is $x$ and is small compared to $1.$ The expression relating the degree of dissociation $(x)$ with equilibrium constant $K_P$ and total pressure $P$ is
Bond order of $1.5$ is shown by-
→