Page 30 - PRE-U STPM CHEMISTRY TERM 1

Chemistry Term 1 STPM

STPM PRACTICE 2

Objective Questions
CHAPTER 1 Which of the following statements is true 6 An orbital always contains

2 regarding the line spectrum of hydrogen? A 0, 1 or 2 electrons C 1 or 2 electrons
A The first line in each series has the longest
D 8 electrons
B 2 electrons
wavelength.
B The ionisation energy of hydrogen can be 7 A d subshell contains how many degenerate
calculated using the line with the lowest orbitals?
frequency in the ultraviolet region. A 1 C 5
C The lines are all equally spaced. B 3 D 7
D The lines converge when the wavelength
increases. 8 In the building up of the electronic configuration
of atoms, electrons are added to the 4s subshell
2 What is the maximum number of atomic orbitals before the 3d subshell because
with the principle quantum number 3? A the 3d subshell can hold more electrons than
A 3 C 9 the 4s subshell.
B 6 D 12 B the 3d subshell is closer to the nucleus.
C the 4s subshell is spherical.
3 Which of the following statements is not true of D the 3d subshell is of higher energy.
the line spectrum of hydrogen atom?
A The lines become closer as frequency 9 Which of the following correctly represents the
increases Balmer series in the line spectrum of hydrogen?
B There are no more lines after the line with A
maximum frequency in the Lyman series
C The spectrum consists of only two series,
Lyman series and Balmer series Wave number
D The lines are produced when the electron B
absorbed energy and gets ‘promoted’ to
higher energy levels
Wave number
4 What is the maximum number of electronic C
transitions possible between the first 7 energy
levels in the hydrogen atom?
A 7 Wave number
B 14 D
C 21
D 5040
Wave number
5 Which of the following statements explains why 10 Tungsten ( W) is used as the element in
the emission spectrum of hydrogen is a line incandescent bulbs. Which of the following is not
74
spectrum? true about the element?
A The hydrogen has only one electron. A Tungsten oxide is amphoteric
B The lone electron in the hydrogen atom can B Tungsten exhibits variable oxidation states in
revolve round the nucleus in fixed orbits only.
its compound
C The energy levels in the hydrogen atom are C The maximum oxidation state of tungsten is
quantised.
D Electrons have dual nature. +6
D Tungsten compounds are used as catalyst

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