1
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The wavelength of a particular electron transition for $\mathrm{He}^{+}$is 100 nm . The wavelength (in $\AA$ ) of H atom for the same transition is

A

1000

B

100

C

4000

D

2000

2
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The energy of second Bohr orbit of hydrogen atom is -3.4 eV . The energy of the fourth Bohr orbit of the $\mathrm{He}^{+}$ ion will be

A

-3.4 eV

B

-13.6 eV

C

-6.8 eV

D

-0.85 eV

3
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { Observe the following data : } $$

$$ \begin{array}{lllll} \hline \text { Ion } & Q^{a+} & X^{b+} & Y^{c+} & Z^{\alpha+} \\ \hline \text { Radius (pm) } & 53 & 66 & 40 & 100 \\ \hline \end{array} $$

$Q^{a+}, X^{b+}, Y^{c+}, Z^{d+}$ are respectively

A

$\mathrm{Mg}^{2+}, \mathrm{Al}^{3+}, \mathrm{Na}^{+}, \mathrm{Si}^{4+}$

B

$\mathrm{Al}^{3+}, \mathrm{Si}^{4+}, \mathrm{Mg}^{2+}, \mathrm{Na}^{+}$

C

$\mathrm{Mg}^{2+}, \mathrm{Si}^{4+}, \mathrm{Al}^{3+}, \mathrm{Na}^{+}$

D

$\mathrm{Al}^{3+}, \mathrm{Mg}^{2+}, \mathrm{Si}^{4+}, \mathrm{Na}^{+}$

4
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { Which of the following sets are correctly matched? } $$

$$ \begin{array}{llll} \hline & \text { Molecule } & \text { Hybridisation } & \text { Geometry } \\ \hline \text { I. } & \mathrm{BrF}_5 & s p^3 d^2 & \text { Square pyramidal } \\ \hline \text { II. } & \mathrm{XeF}_6 & s p^3 d^3 & \text { Distorted octahedral } \\ \hline \text { III. } & \mathrm{SF}_4 & d s p^2 & \text { Square planar } \\ \hline \text { IV. } & \mathrm{PbCl}_2 & s p & \text { Linear } \\ \hline \end{array} $$

A

I and IV

B

II and III

C

III and IV

D

I and II