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Chemistry_101_June
20. A hydrogen atom in the ground state is ionized. What are the values of \( n \) and \( n \) ?
(A) \( n_{i}=0, n_{i}=\infty \)
(B) \( \quad n_{i}=0, n_{f}=1 \)
(C) \( n=1, n=\infty \)
(D) \( n_{i}=\infty, n_{f}=1 \)
(E) \( n_{i}=\infty, n_{1}=1 \)
SECTION A CONTINUES ON THE NEXT PAGE
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Chemistry 101
Junc 2023
SECTION A CONTINUED...
21. Which of the following has the smallest ionization energy?
(A) Bi
(B) At
(C) \( \mathrm{Po} \)
(D) \( \mathrm{Pb} \)
(E) Cs
22. What is the wavelength of a 148 -g cricket boll traveling at \( 0.0422 \mathrm{~km} / \mathrm{s} \) ? (2 marks)
(A) \( 3.39 \times 10^{17} \mathrm{~m} \)
(B) \( 1.06 \times 10^{-34} \mathrm{~m} \)
(C) \( 9.43 \times 10^{33} \mathrm{~m} \)
(D) \( 2.95 \times 10^{-48} \mathrm{~m} \)
(E) \( 1.06 \times 10^{-17} \mathrm{~m} \)
23. The number of orbitals in an \( x \) subshell is
(A) 1
(B) 2
(C) 3
(D) 5
(E) 7
24. The strongest intermolecular forces present in a sample of pure is are
(A) London forces.
(B) covalent bonds.
(C) covalent network bonds.
(D) dipole-dipole forces.
(E) metallic bonds.
25. The approximate \( \mathrm{H}-\mathrm{C}-\mathrm{C} \) bond angle in ethane, \( \mathrm{C}_{2} \mathrm{H}_{\mathrm{n}} \), is
(A) \( 180^{\circ} \).
(B) \( 120^{\circ} \)
(C) \( 60^{\circ} \)
(D) \( 90^{\circ} \)
(E) \( 109^{\circ} \)
26. Which of the following atoms is the most electronegative?
(A) Al
(B) Cs
(C) \( \mathrm{B} \)
(D) \( \mathrm{Na} \)
(E) \( \mathrm{N} \)
27. The correct hybridisation of the indicated utom in the molecule below is:
(A) \( s p^{2} \)
(B) \( s p^{3} \)
(C) \( s p \)
(D) \( s p^{4} \)
(E) \( \pi \)-bond
28. Which of the following structures is NOT an acceptable line formula for \( \mathrm{CH}_{3} \mathrm{CHClCCH} \) ?
A.
(A)
日.
c
D
iv
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