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Federal Board SSC-1 Chemistry Test # 1: Section-B (Marks 18)

This document contains a chemistry test with multiple choice and short answer questions. Section B contains 6 short answer questions worth 3 marks each on topics like the mass of atoms/molecules, atomic structure definitions, and electron configurations. Section C has 5 short answer questions worth 3 marks each about electron affinity, isotope similarities/differences, oxidation reactions, and properties of elements. Section D provides 2 long answer questions worth 10 marks each, one comparing ionization energies of alkali and alkaline earth metals and importance of sodium, magnesium and calcium, the other explaining shielding effect and atomic size trends and identifying positions of elements in the periodic table.

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Sohail Hameed
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189 views2 pages

Federal Board SSC-1 Chemistry Test # 1: Section-B (Marks 18)

This document contains a chemistry test with multiple choice and short answer questions. Section B contains 6 short answer questions worth 3 marks each on topics like the mass of atoms/molecules, atomic structure definitions, and electron configurations. Section C has 5 short answer questions worth 3 marks each about electron affinity, isotope similarities/differences, oxidation reactions, and properties of elements. Section D provides 2 long answer questions worth 10 marks each, one comparing ionization energies of alkali and alkaline earth metals and importance of sodium, magnesium and calcium, the other explaining shielding effect and atomic size trends and identifying positions of elements in the periodic table.

Uploaded by

Sohail Hameed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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THE MARK ACADEMY

Federal Board SSC-1


Chemistry Test # 1
Time Allowed: 2.15 hours Total Marks: 53

SECTION-B (MARKS 18)


Q.2 Attempt any SIX parts from the following. All parts carry equals marks. (6*3=18)
i. Why one mole of Oxygen gas and one mole of Oxygen atoms have different masses?
ii. Describe how Avogadro’s number is related to a mole of any substance.
iii. Define:
a-ion b-molecular ion c-free radical d-atomic number e-formula unit .
iv. Differentiate between molecular ion and free radical.
v. Calculate the mass of the following:
a) 3.24 exp18 atoms of iron b) 2 exp10 molecules of nitrogen gas
c)3 exp6 atoms of Al
vi. Which atom has lower shielding effect ,Li or Na?
vii. Explain why, Na has higher ionization energy than K?
viii. Write the valence shell electronic configuration for the following:
a)Alkali metals b)Alkaline earth metals c)Halogens
d)Noble Gases

SECTION-C (MARKS 15)


Q.3 Attempt any FIVE parts from the following. All parts carry equals marks. (5*3=15)
i. Define Electron Affinity also Write its trends?
ii. Write the ways in which isotopes of an element is similar and differ?
iii. Can F2 oxidize all the halides ions to free electrons? Explain with equations.
iv. Give some important applications of Platinum and Gold?
v. Which element is more metallic Mg or AL? Explain.
vi. What is aqua regia? Also write its importance?
vii. What is IC’s and also write its importance?

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THE MARK ACADEMY

SECTION-D (MARKS 20)


NOTE: Attempt any TWO parts from the following. All parts carry equals marks. (2*10=20)
Q.4 a. Briefly explain the Ionization energies of Alkali and Alkaline Earth metals. (04)
b. What is the importance of Sodium, Magnesium and Calcium? Also write
Equations. (06)
Q.5 a. Briefly explain the Shielding Effect, Atomic size and Ionization Energy with trends.
(06)
b. Find the position of the following elements in the periodic table from the electronic
Configuration: (04)
a) Aluminum (13) b) Magnesium (12) c) Nitrogen (7)
d) Oxygen (8)

Q.6 a. Define Chemistry. Also define its branches? (05)


b. Write postulates of Dalton’s Atomic Theory? Also explain how Dalton’s theory open
ways to others scientists? (05)

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