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Chemistry
11th -
12thgrade
Unit-1 / AS level chemistry- multiple choice questions.
10 questions
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- 1. Multiple Choice
The isotopes of magnesium, 24Mg and 25Mg, both form ions with charge 2+. Which of
the following statements about these ions is true?
Both ions have electronic configuration 1s2 2s2 2p6 3s2
The ions have the same number of electrons but different numbers of neutrons.
The ions have the same number of neutrons but different numbers of protons.
- 2. Multiple Choice
Chlorine has two isotopes with relative isotopic mass 35 and 37. Four m/z values are given below. Which will occur in a mass spectrum of chlorine gas, Cl2, from an ion with a single positive charge?
35.5
36
71
72
- 3. Multiple Choice
The human body contains around 0.025 g of iodine molecules, I2. Which of the following shows the number of iodine atoms in 0.025 g of I2?
- 4. Multiple Choice
Which equation represents the reaction for which the enthalpy change, ΔH, is the mean bond enthalpy of the C–H bond?
¼CH4(g) → ¼C(g) + H(g)
CH4(g) → C(s) + 2H2(g)
CH4(g) → C(g) + 4H(g)
CH4(g) → C(g) + 2H2(g)
- 5. Multiple Choice
The first ionization energies, in kJ mol–1, of four elements with consecutive atomic numbers are shown below.
A 1680
B 2080
C 496
D 738
Which element could be an inert gas?
A
B
C
D
- 6. Multiple Choice
The graph above shows the second ionization energy of a series of elements with consecutive atomic numbers.
Which element could be lithium?
A
B
C
D
- 7. Multiple Choice
The first five ionization energies, in kJ mol–1, of aluminium are
578 1817 2745 11 578 14 831
The orbitals from which the first five electrons are removed during ionization, starting with the first electron, are
1s 2s 2p 3s 3p
1s 1s 2s 2s 2p
3p 3s 2p 2s 1s
3p 3s 3s 2p 2p
- 8. Multiple Choice
Going across the Periodic Table from sodium to aluminium,
the melting temperature increases.
the radius of the atom increases.
the radius of the metal ion increases.
the bonding in the element changes from metallic to covalent.
- 9. Multiple Choice
Going down Group 1 from lithium to rubidium
the radius of the atom decreases.
the radius of the ion decreases.
the first ionization energy decreases.
the polarizing power of the ion increases.
- 10. Multiple Choice
Which of the following mixtures could not form whe octane, C8H18, is cracked?
propane + pentene
butane + butene
pentane + propene
heptane + ethene
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