AP EAPCET 2024 - 20th May Morning Shift | Atomic Structure Question 9 | Chemistry

The angular momentum of an electron in a stationary state of $\mathrm{Li}^{2+}(Z=3)$ is $3 h / \pi$. The radius and energy of that stationary state are respectively

$3.174 \ $$\mathop A\limits^ \circ $$,-5.45 \times 10^{-19} \mathrm{~J}$

$6.348 \ $$\mathop A\limits^ \circ $$,-5.45 \times 10^{-19} \mathrm{~J}$

$6.348 \ $$\mathop A\limits^ \circ $$,+5.45 \times 10^{-18} \mathrm{~J}$

$2.116 \ $$\mathop A\limits^ \circ $$,-5.45 \times 10^{-19} \mathrm{~J}$

AP EAPCET 2024 - 20th May Morning Shift

MCQ (Single Correct Answer)

-0

Identify the pair of elements in which number of electrons in ( $n-1$ ) shell is same

$\mathrm{Fe}, \mathrm{Mn}$

$\mathrm{Zn}, \mathrm{Fe}$

$\mathrm{K}, \mathrm{Sc}$

$\mathrm{Mn}, \mathrm{Cr}$

AP EAPCET 2024 - 19th May Evening Shift

MCQ (Single Correct Answer)

-0

In the ground state of hydrogen atom, electron absorbs 1.5 times energy than the minimum energy $\left(2.18 \times 10^{-18} \mathrm{~J}\right)$ to escape from the atom. The wavelength of the emitted electron (in $m$ ) is ( $m_e=9 \times 10^{-31} \mathrm{~kg}$ )

$\frac{h \times 10^{24}}{\sqrt{1.962}}$

$\frac{h}{\sqrt{1.962}} \times 10^{23}$

$\frac{h}{\sqrt{1.962}} \times 10^{25}$

$\frac{h}{\sqrt{1.962}} \times 10^{22}$

AP EAPCET 2024 - 19th May Evening Shift

MCQ (Single Correct Answer)

-0

A golf ball of mass $m \mathrm{~g}$ has a speed of $50 \mathrm{~ms}^{-1}$. If the speed can be measured within accuracy of $2 \%$ the uncertainty in the position is (in m)

$\frac{h}{4 \pi m}$

$\frac{h}{16 \pi m}$

$\frac{h}{4 \pi m} \times 10^3$

$\frac{h}{16 \pi m} \times 10^3$

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