The Sylhet Khajanchibari International School & College
SSC Model Test-1
Class: X (NC)
Subject- Chemistry (CQ)
Time: 2 Hours 35 minutes
Full Marks: 50
(Answer any five of the following Questions)
1)
i) Zn + H2SO4 → ZnSO4 + H2 (g)
ii) A2 + 3B2 ⇌ 3AB2 + 346 KJ
a) What is hydrolysis?
b) What is the difference between oxidation number and valency?
c) What type of reaction of i) is? Explain.
d) Analyze the temperature and pressure effect on the chemical equilibrium of reaction ii) of the stem
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4
2)
Elements
A
B
C
Atomic number
12
6
9
[A, B, and C are the symbolic term]
a)
b)
c)
d)
What is duet rule?
Helium is an inert gas – Explain it?
Describe the bond formation process of the compound formed by A and C.
Though AC2 is soluble in water but BC4 is not soluble. Explain with logic.
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3) The three isotopes of Oxygen are 16O, 17O, and 18O found in nature and their percentage of abundance is
99.76%, 0.037%, and 0.204% respectively. 99Tc, 131I, 60Co, and 32P are radioactive isotopes.
a.
b.
c.
d.
What is relative atomic mass?
Why does the 19th electron of K go to 4s instead of 3d?
Determine the relative atomic mass of the stimulus element.
How the isotopes in the second line in the stem are used in medical science? Explain.
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4)
a)
b)
c)
d)
What is orbital?
Sodium atom is electrically neutral. - Explain.
Calculate the angular momentum of an electron in the last of the above model.
Analyze the importance of the above model mentioned in the stem for explanation of the
structure of an atom.
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