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Chemistry group 33
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Qormaatni Biyyoolessaa Xumura Barnoota Sadarkaa 2ffaa Kutaa 12ffaa Bara 2018 Waxabajjii 23/2018 kan eegalamu ta'uu, Daayirektarri Tajaajila Madaallii Barnootaa fi Qormaatilee biyyoolessaa Dr. Isheetuu Kabbadaa beeksisaniiru.
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Chemistry multiple choice questions and answers
1.what is oxidation?
A) the addition of hydrogen to a substance and the removal of oxygen from a substance
B) the loss of electrons by a species , accompanied by an increase in oxidation number
C) the reduction of oxidation state of the oxidizing agent
D) the addition of electrons to the oxidizing agent
✅ Answer B
2.detergents are better than soaps because they
A) are naturally available
B) are biodegradable
C) can be used in hard water
D) none
✅ Answer C
3.All of the following properties of an element increase across a period. EXCEPT;
A) Electron affinity
B) Atomic size
C) Electronegativity
D) Ionization energy
✅ Answer B
4.Which of the following represents a tentative explanation of a certain scientific law?
A) Hypothesis
B) Observation
C) Experimentation
D) Theory
✅ Answer A
5.what is the maximum number of unpaired electrons in a d subshell?
A) 7
B) 8
C) 5
D) 4
✅ Answer C
6. If we increase the concentration of a reactant , what happens to the collisions between particles?
A) There are the same number of collisions, but they have less energy.
B) There are the same number of collisions, but they have more energy.
C) There are the same number of collisions.
D) There are more collisions
✅ Answer D
7.Which one of the following combinations CANNOT produce a buffer solution?
A.HClO4 and NaClO4
B. HNO2 and NaNO2
C. HCN and NaCN
D. NH3 and (NH4)2SO4
✅ Answer A
8.What is a titrant? It is a
A) solution of unknown concentration
B) diluted solution
C) solution of known concentration
D) weak solution
✅ Answer C
9.Reducing agent is a substance that is
A) reduced
B) oxidized
C) unaffected
D) reduced in oxidation number
✅ Answer B
10. Which one of the following is TRUE about the relative strength of a base?
A) Ionization of a base increases with its strength.
B) Ionization of a base decreases with its strength.
C) Weak bases dissociate completely in water.
D) Strong bases dissociate partially in water
✅ Answer A
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